Bonjour,
Comment expand l'expréssion ci-dessous comme un polynome en les variables x,y :
R:=((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*(108*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)^2*y^5*((-xi-tau-lambda-mu*beta-4-nu-4*mu-4*tau*eta-lambda*eta-tau*alpha-nu*eta-nu*beta-tau*beta-lambda*beta-xi*eta-4*alpha-4*eta-4*beta-mu*alpha-lambda*alpha-mu*eta-4*xi*beta-4*nu*alpha-xi*alpha)*y^3*x+(4*tau+4*lambda+4*nu+4*mu+4*xi+10)*y^3*x^2+(alpha*beta+alpha*eta+mu*alpha+nu*alpha*beta+alpha+xi*beta+xi*alpha*beta+beta*eta+nu*alpha+mu*beta+nu*alpha*eta+eta+tau*eta+tau*alpha*eta+beta+mu*eta+xi*beta*eta+tau*beta*eta)*y^3)^5+144*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*((-6*lambda-10-6*mu-6*tau-6*xi-6*nu)*y^2*x^3+(6*tau*eta+6*xi*beta+6*nu*alpha+6*beta+3*mu*eta+3*lambda*eta+3*tau*beta+3*nu+6*eta+3*xi*alpha+6*alpha+3*mu*alpha+3*lambda*alpha+3*xi*eta+3*tau+3*tau*alpha+3*lambda*beta+3*nu*eta+6*mu+3*xi+6+3*lambda+3*nu*beta+3*mu*beta)*y^2*x^2+(-3*beta*eta-3*xi*beta-3*alpha*beta-3*alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-3*nu*alpha*eta-3*mu*eta-lambda*alpha*eta-3*tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-3*nu*alpha*beta-3*xi*alpha*beta-nu*beta-3*mu*beta-3*mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-3*beta-tau*beta-xi*alpha-lambda*eta-3*alpha-3*tau*beta*eta-mu*beta*eta-3*eta-3*xi*beta*eta-3*nu*alpha-3*tau*eta)*y^2*x+(tau*alpha*eta+tau*beta*eta+alpha*beta+xi*alpha*beta+nu*alpha*beta+xi*beta*eta+nu*alpha*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+tau*alpha*beta*eta+mu*beta*eta+alpha*beta*eta+beta*eta+alpha*eta+mu*alpha*eta+mu*alpha*beta)*y^2)*((alpha*beta*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+mu*alpha*beta*eta+tau*alpha*beta*eta)*y+(-4*xi*beta-4*nu*alpha-3*tau-3*xi-3*xi*alpha-3*lambda*eta-3*tau*alpha-3*nu*beta-3*mu*eta-4*eta-4*tau*eta-3*mu*alpha-4*beta-3*lambda*beta-3*mu*beta-4*alpha-3*tau*beta-3*lambda*alpha-4-3*lambda-3*nu*eta-3*xi*eta-4*mu-3*nu)*y*x^3+(4*nu+4*tau+4*xi+4*lambda+4*mu+5)*y*x^4+(3*beta*eta+3*xi*beta+3*alpha*beta+3*alpha*eta+2*lambda*beta*eta+2*xi*alpha*eta+2*tau*alpha*beta+2*mu*alpha*eta+3*nu*alpha*eta+3*mu*eta+2*lambda*alpha*eta+3*tau*alpha*eta+2*lambda*alpha*beta+2*mu*alpha*beta+3*nu*alpha*beta+3*xi*alpha*beta+2*nu*beta+3*mu*beta+3*mu*alpha+2*tau*alpha+2*xi*eta+2*nu*beta*eta+2*lambda*beta+2*nu*eta+2*lambda*alpha+3*beta+2*tau*beta+2*xi*alpha+2*lambda*eta+3*alpha+3*tau*beta*eta+2*mu*beta*eta+3*eta+3*xi*beta*eta+3*nu*alpha+3*tau*eta)*y*x^2+(-2*tau*alpha*eta-xi*alpha*eta-2*xi*alpha*beta-2*mu*alpha*eta-2*nu*alpha*beta*eta-2*tau*alpha*beta*eta-tau*alpha*beta-2*beta*eta-2*mu*beta*eta-lambda*beta*eta-2*alpha*beta-nu*beta*eta-2*alpha*eta-lambda*alpha*eta-lambda*alpha*beta-2*mu*alpha*beta-2*xi*alpha*beta*eta-2*alpha*beta*eta-2*nu*alpha*beta-2*xi*beta*eta-2*nu*alpha*eta-lambda*alpha*beta*eta-mu*alpha*beta*eta-2*tau*beta*eta)*y*x)^2*((-5-tau-xi-lambda-nu-mu)*x*y^4+(nu*alpha+tau*eta+alpha+xi*beta+eta+beta+mu+1)*y^4)^4-4*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*((-6*lambda-10-6*mu-6*tau-6*xi-6*nu)*y^2*x^3+(6*tau*eta+6*xi*beta+6*nu*alpha+6*beta+3*mu*eta+3*lambda*eta+3*tau*beta+3*nu+6*eta+3*xi*alpha+6*alpha+3*mu*alpha+3*lambda*alpha+3*xi*eta+3*tau+3*tau*alpha+3*lambda*beta+3*nu*eta+6*mu+3*xi+6+3*lambda+3*nu*beta+3*mu*beta)*y^2*x^2+(-3*beta*eta-3*xi*beta-3*alpha*beta-3*alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-3*nu*alpha*eta-3*mu*eta-lambda*alpha*eta-3*tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-3*nu*alpha*beta-3*xi*alpha*beta-nu*beta-3*mu*beta-3*mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-3*beta-tau*beta-xi*alpha-lambda*eta-3*alpha-3*tau*beta*eta-mu*beta*eta-3*eta-3*xi*beta*eta-3*nu*alpha-3*tau*eta)*y^2*x+(tau*alpha*eta+tau*beta*eta+alpha*beta+xi*alpha*beta+nu*alpha*beta+xi*beta*eta+nu*alpha*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+tau*alpha*beta*eta+mu*beta*eta+alpha*beta*eta+beta*eta+alpha*eta+mu*alpha*eta+mu*alpha*beta)*y^2)^3*((-xi-tau-lambda-mu*beta-4-nu-4*mu-4*tau*eta-lambda*eta-tau*alpha-nu*eta-nu*beta-tau*beta-lambda*beta-xi*eta-4*alpha-4*eta-4*beta-mu*alpha-lambda*alpha-mu*eta-4*xi*beta-4*nu*alpha-xi*alpha)*y^3*x+(4*tau+4*lambda+4*nu+4*mu+4*xi+10)*y^3*x^2+(alpha*beta+alpha*eta+mu*alpha+nu*alpha*beta+alpha+xi*beta+xi*alpha*beta+beta*eta+nu*alpha+mu*beta+nu*alpha*eta+eta+tau*eta+tau*alpha*eta+beta+mu*eta+xi*beta*eta+tau*beta*eta)*y^3)^2*((-5-tau-xi-lambda-nu-mu)*x*y^4+(nu*alpha+tau*eta+alpha+xi*beta+eta+beta+mu+1)*y^4)^2+16*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*((-6*lambda-10-6*mu-6*tau-6*xi-6*nu)*y^2*x^3+(6*tau*eta+6*xi*beta+6*nu*alpha+6*beta+3*mu*eta+3*lambda*eta+3*tau*beta+3*nu+6*eta+3*xi*alpha+6*alpha+3*mu*alpha+3*lambda*alpha+3*xi*eta+3*tau+3*tau*alpha+3*lambda*beta+3*nu*eta+6*mu+3*xi+6+3*lambda+3*nu*beta+3*mu*beta)*y^2*x^2+(-3*beta*eta-3*xi*beta-3*alpha*beta-3*alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-3*nu*alpha*eta-3*mu*eta-lambda*alpha*eta-3*tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-3*nu*alpha*beta-3*xi*alpha*beta-nu*beta-3*mu*beta-3*mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-3*beta-tau*beta-xi*alpha-lambda*eta-3*alpha-3*tau*beta*eta-mu*beta*eta-3*eta-3*xi*beta*eta-3*nu*alpha-3*tau*eta)*y^2*x+(tau*alpha*eta+tau*beta*eta+alpha*beta+xi*alpha*beta+nu*alpha*beta+xi*beta*eta+nu*alpha*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+tau*alpha*beta*eta+mu*beta*eta+alpha*beta*eta+beta*eta+alpha*eta+mu*alpha*eta+mu*alpha*beta)*y^2)^3*y^5*((-xi-tau-lambda-mu*beta-4-nu-4*mu-4*tau*eta-lambda*eta-tau*alpha-nu*eta-nu*beta-tau*beta-lambda*beta-xi*eta-4*alpha-4*eta-4*beta-mu*alpha-lambda*alpha-mu*eta-4*xi*beta-4*nu*alpha-xi*alpha)*y^3*x+(4*tau+4*lambda+4*nu+4*mu+4*xi+10)*y^3*x^2+(alpha*beta+alpha*eta+mu*alpha+nu*alpha*beta+alpha+xi*beta+xi*alpha*beta+beta*eta+nu*alpha+mu*beta+nu*alpha*eta+eta+tau*eta+tau*alpha*eta+beta+mu*eta+xi*beta*eta+tau*beta*eta)*y^3)^3-36*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*((alpha*beta*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+mu*alpha*beta*eta+tau*alpha*beta*eta)*y+(-4*xi*beta-4*nu*alpha-3*tau-3*xi-3*xi*alpha-3*lambda*eta-3*tau*alpha-3*nu*beta-3*mu*eta-4*eta-4*tau*eta-3*mu*alpha-4*beta-3*lambda*beta-3*mu*beta-4*alpha-3*tau*beta-3*lambda*alpha-4-3*lambda-3*nu*eta-3*xi*eta-4*mu-3*nu)*y*x^3+(4*nu+4*tau+4*xi+4*lambda+4*mu+5)*y*x^4+(3*beta*eta+3*xi*beta+3*alpha*beta+3*alpha*eta+2*lambda*beta*eta+2*xi*alpha*eta+2*tau*alpha*beta+2*mu*alpha*eta+3*nu*alpha*eta+3*mu*eta+2*lambda*alpha*eta+3*tau*alpha*eta+2*lambda*alpha*beta+2*mu*alpha*beta+3*nu*alpha*beta+3*xi*alpha*beta+2*nu*beta+3*mu*beta+3*mu*alpha+2*tau*alpha+2*xi*eta+2*nu*beta*eta+2*lambda*beta+2*nu*eta+2*lambda*alpha+3*beta+2*tau*beta+2*xi*alpha+2*lambda*eta+3*alpha+3*tau*beta*eta+2*mu*beta*eta+3*eta+3*xi*beta*eta+3*nu*alpha+3*tau*eta)*y*x^2+(-2*tau*alpha*eta-xi*alpha*eta-2*xi*alpha*beta-2*mu*alpha*eta-2*nu*alpha*beta*eta-2*tau*alpha*beta*eta-tau*alpha*beta-2*beta*eta-2*mu*beta*eta-lambda*beta*eta-2*alpha*beta-nu*beta*eta-2*alpha*eta-lambda*alpha*eta-lambda*alpha*beta-2*mu*alpha*beta-2*xi*alpha*beta*eta-2*alpha*beta*eta-2*nu*alpha*beta-2*xi*beta*eta-2*nu*alpha*eta-lambda*alpha*beta*eta-mu*alpha*beta*eta-2*tau*beta*eta)*y*x)^3*((-5-tau-xi-lambda-nu-mu)*x*y^4+(nu*alpha+tau*eta+alpha+xi*beta+eta+beta+mu+1)*y^4)^3*y^5-6*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)*((alpha*beta*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+mu*alpha*beta*eta+tau*alpha*beta*eta)*y+(-4*xi*beta-4*nu*alpha-3*tau-3*xi-3*xi*alpha-3*lambda*eta-3*tau*alpha-3*nu*beta-3*mu*eta-4*eta-4*tau*eta-3*mu*alpha-4*beta-3*lambda*beta-3*mu*beta-4*alpha-3*tau*beta-3*lambda*alpha-4-3*lambda-3*nu*eta-3*xi*eta-4*mu-3*nu)*y*x^3+(4*nu+4*tau+4*xi+4*lambda+4*mu+5)*y*x^4+(3*beta*eta+3*xi*beta+3*alpha*beta+3*alpha*eta+2*lambda*beta*eta+2*xi*alpha*eta+2*tau*alpha*beta+2*mu*alpha*eta+3*nu*alpha*eta+3*mu*eta+2*lambda*alpha*eta+3*tau*alpha*eta+2*lambda*alpha*beta+2*mu*alpha*beta+3*nu*alpha*beta+3*xi*alpha*beta+2*nu*beta+3*mu*beta+3*mu*alpha+2*tau*alpha+2*xi*eta+2*nu*beta*eta+2*lambda*beta+2*nu*eta+2*lambda*alpha+3*beta+2*tau*beta+2*xi*alpha+2*lambda*eta+3*alpha+3*tau*beta*eta+2*mu*beta*eta+3*eta+3*xi*beta*eta+3*nu*alpha+3*tau*eta)*y*x^2+(-2*tau*alpha*eta-xi*alpha*eta-2*xi*alpha*beta-2*mu*alpha*eta-2*nu*alpha*beta*eta-2*tau*alpha*beta*eta-tau*alpha*beta-2*beta*eta-2*mu*beta*eta-lambda*beta*eta-2*alpha*beta-nu*beta*eta-2*alpha*eta-lambda*alpha*eta-lambda*alpha*beta-2*mu*alpha*beta-2*xi*alpha*beta*eta-2*alpha*beta*eta-2*nu*alpha*beta-2*xi*beta*eta-2*nu*alpha*eta-lambda*alpha*beta*eta-mu*alpha*beta*eta-2*tau*beta*eta)*y*x)^2*((-5-tau-xi-lambda-nu-mu)*x*y^4+(nu*alpha+tau*eta+alpha+xi*beta+eta+beta+mu+1)*y^4)^3*((-xi-tau-lambda-mu*beta-4-nu-4*mu-4*tau*eta-lambda*eta-tau*alpha-nu*eta-nu*beta-tau*beta-lambda*beta-xi*eta-4*alpha-4*eta-4*beta-mu*alpha-lambda*alpha-mu*eta-4*xi*beta-4*nu*alpha-xi*alpha)*y^3*x+(4*tau+4*lambda+4*nu+4*mu+4*xi+10)*y^3*x^2+(alpha*beta+alpha*eta+mu*alpha+nu*alpha*beta+alpha+xi*beta+xi*alpha*beta+beta*eta+nu*alpha+mu*beta+nu*alpha*eta+eta+tau*eta+tau*alpha*eta+beta+mu*eta+xi*beta*eta+tau*beta*eta)*y^3)^2-192*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta+nu*alpha*eta+lambda*beta*eta+nu*alpha*beta+xi*alpha*beta+tau*alpha*beta+mu*alpha*beta+mu*alpha*beta*eta+lambda*alpha*beta+alpha*beta*eta+tau*alpha*eta+nu*beta*eta+xi*alpha*beta*eta+xi*alpha*eta+nu*alpha*beta*eta+mu*beta*eta+lambda*alpha*eta+alpha*beta+tau*alpha*beta*eta+mu*alpha*eta+xi*beta*eta+alpha*eta)*x^2+(-xi-mu-1-tau-nu-lambda)*x^5+(-beta*eta-xi*beta-alpha*beta-alpha*eta-lambda*beta*eta-xi*alpha*eta-tau*alpha*beta-mu*alpha*eta-nu*alpha*eta-mu*eta-lambda*alpha*eta-tau*alpha*eta-lambda*alpha*beta-mu*alpha*beta-nu*alpha*beta-xi*alpha*beta-nu*beta-mu*beta-mu*alpha-tau*alpha-xi*eta-nu*beta*eta-lambda*beta-nu*eta-lambda*alpha-beta-tau*beta-xi*alpha-lambda*eta-alpha-tau*beta*eta-mu*beta*eta-eta-xi*beta*eta-nu*alpha-tau*eta)*x^3)^2*((-xi-tau-lambda-mu*beta-4-nu-4*mu-4*tau*eta-lambda*eta-tau*alpha-nu*eta-nu*beta-tau*beta-lambda*beta-xi*eta-4*alpha-4*eta-4*beta-mu*alpha-lambda*alpha-mu*eta-4*xi*beta-4*nu*alpha-xi*alpha)*y^3*x+(4*tau+4*lambda+4*nu+4*mu+4*xi+10)*y^3*x^2+(alpha*beta+alpha*eta+mu*alpha+nu*alpha*beta+alpha+xi*beta+xi*alpha*beta+beta*eta+nu*alpha+mu*beta+nu*alpha*eta+eta+tau*eta+tau*alpha*eta+beta+mu*eta+xi*beta*eta+tau*beta*eta)*y^3)*((alpha*beta*eta+xi*alpha*beta*eta+nu*alpha*beta*eta+mu*alpha*beta*eta+tau*alpha*beta*eta)*y+(-4*xi*beta-4*nu*alpha-3*tau-3*xi-3*xi*alpha-3*lambda*eta-3*tau*alpha-3*nu*beta-3*mu*eta-4*eta-4*tau*eta-3*mu*alpha-4*beta-3*lambda*beta-3*mu*beta-4*alpha-3*tau*beta-3*lambda*alpha-4-3*lambda-3*nu*eta-3*xi*eta-4*mu-3*nu)*y*x^3+(4*nu+4*tau+4*xi+4*lambda+4*mu+5)*y*x^4+(3*beta*eta+3*xi*beta+3*alpha*beta+3*alpha*eta+2*lambda*beta*eta+2*xi*alpha*eta+2*tau*alpha*beta+2*mu*alpha*eta+3*nu*alpha*eta+3*mu*eta+2*lambda*alpha*eta+3*tau*alpha*eta+2*lambda*alpha*beta+2*mu*alpha*beta+3*nu*alpha*beta+3*xi*alpha*beta+2*nu*beta+3*mu*beta+3*mu*alpha+2*tau*alpha+2*xi*eta+2*nu*beta*eta+2*lambda*beta+2*nu*eta+2*lambda*alpha+3*beta+2*tau*beta+2*xi*alpha+2*lambda*eta+3*alpha+3*tau*beta*eta+2*mu*beta*eta+3*eta+3*xi*beta*eta+3*nu*alpha+3*tau*eta)*y*x^2+(-2*tau*alpha*eta-xi*alpha*eta-2*xi*alpha*beta-2*mu*alpha*eta-2*nu*alpha*beta*eta-2*tau*alpha*beta*eta-tau*alpha*beta-2*beta*eta-2*mu*beta*eta-lambda*beta*eta-2*alpha*beta-nu*beta*eta-2*alpha*eta-lambda*alpha*eta-lambda*alpha*beta-2*mu*alpha*beta-2*xi*alpha*beta*eta-2*alpha*beta*eta-2*nu*alpha*beta-2*xi*beta*eta-2*nu*alpha*eta-lambda*alpha*beta*eta-mu*alpha*beta*eta-2*tau*beta*eta)*y*x)*((-5-tau-xi-lambda-nu-mu)*x*y^4+(nu*alpha+tau*eta+alpha+xi*beta+eta+beta+mu+1)*y^4)^4+144*((-lambda*alpha*beta*eta-mu*alpha*beta*eta-nu*alpha*beta*eta-alpha*beta*eta-xi*alpha*beta*eta-tau*alpha*beta*eta)*x+(xi+xi*beta+tau+lambda+lambda*eta+lambda*beta+xi*eta+tau*beta+mu*beta+mu*eta+mu*alpha+xi*alpha+tau*eta+beta+lambda*alpha+mu+eta+nu*beta+tau*alpha+nu*eta+nu*alpha+alpha+1+nu)*x^4+(tau*beta*eta+lambda*alpha*beta*eta+beta*eta;
Avec mes plus vifs remmerciments,
Gérard.
