Bendesarts

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These are questions asked by Bendesarts

Hello, 
I'd like to identify terms before the differential terms (theta(t), diff(theta(t),t) ...)

The following code with coeff function works for  diff(theta(t), t, t)) but not for diff(theta(t), t)
Here the code :
eq1pp := R(t) = -(-sin(theta[0]+phi)*Isup-sin(theta[0]+phi)*L[fixe]^2*M[fixe]-sin(theta[0]+phi)*L[r]^2*M[r]-sin(theta[0]+phi)*L[sup]^2*M[sup]+cos(theta[0]+phi)*a*sin(phi)*L[fixe]*M[fixe]+cos(theta[0...

Hello,

I'd like to solve  a system of 3 équations and 3 unknows. The system is composed with 3 trigonometric equations and the unknows are the angles gamma_e[1], psi_e[1],phi_e[1] which belongs between 0 and PI.
I have tried this with SOLVE function and i didn't have any results

Code:

Hello, 

I'd like to modify the form of this expression

Code:
den := 1.*omega^4/omega[n]^4+1.-2.*omega^2/omega[n]^2+4.*epsilon^2*omega^2/omega[n]^2



To manage to have this form.

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