diff(phi(t),t)^2*cos(phi(t))*a__ks*m__k+cos(phi(t))*diff(phi(t),t)^2*a__sss*
m__ss+diff(phi(t),t)^2*cos(phi(t))*l__k*m__ko+diff(phi(t),t)^2*cos(phi(t))*l__k
*m__p+diff(diff(phi(t),t),t)*sin(phi(t))*a__ks*m__k+diff(diff(phi(t),t),t)*sin(
phi(t))*a__sss*m__ss+diff(diff(phi(t),t),t)*sin(phi(t))*l__k*m__ko+diff(diff(
phi(t),t),t)*sin(phi(t))*l__k*m__p+5000000*A*exp(-4/961*(100*Pi*trunc(1/4*(phi(
t)+Pi)/Pi)-25*phi(t)+9)^2)*u+200000*u*A = 0

@Carl Love 

Hi Carl, thanks for the quick answer ! Here is the plain text of Lagerkraft :