Hello! Is it possible to transform the following expression, the way that instead of sin(x) I'd like to have cos(x) functions. Which command does this? k1*sin(x) - k2*sin(2*x) Thx!

Hi! My problem is the following: v := Vector([v1, v2]); m := Matrix([[m11, m12], [m21, m22]]); C := m.v; Then Maple returns with C in the following form: m11*beta+m12*r m21*beta+m22*r And I want Maple to return in the form: [m11 m12 * [v1 m21 m22] v2] Thanks!

Hi all! Please help me to simplify the following expression: ex1 := C10*C20*a^2+2*C10*C20*a*b+C10*C20*b^2-m*u^2*a*C10+m*u^2*b*C20+1/2*e1*e2*a^2+e1*e2*a*b+1/2*e1*e2*b^2; 1, I've tried the followings: collect(ex,e1*e2); Error, (in collect) cannot collect e1*e2 2, then I've read some advice here in the forum, and tried this: subs(e1*e2=z,%); collect(%,z); S0_temp2:=subs(z=e1*e2,%); This doesn't works as well. It simply doesn't substitutes z for e1*e2. My goal would be to get something like this: (a+b)^2*(C10*C20+1/2*e1*e2)-m*u^2*(a*C10-b*C20); Thanks!