## Differential problem

Dear all,

I am a newbie at this site. I have a problem in working out the following formula. Who can help me or give me a hint ?

$torque - ( -\frac{np}{2}\cdot (ib(t)\cdot cos(\frac{np}{2}\cdot \Theta (t)) - ia(t) \cdot sin(\frac{np}{2}\cdot \Theta (t))+ d \cdot \frac{d}{dt}\Theta (t) +j\cdot \frac{d^2}{dt^2}\Theta (t)) = 0$

Find $\Theta (t)$

Kind regards

Hopi