# Math Help - Proof that this sine equation isn't solvable

1. ## Proof that this sine equation isn't solvable

Hi,I need to show that the following equation is not solvable:
$\ddot{\theta}(t)+a\dot{\theta}(t)+b\sin\theta(t)+\ sin\left(ct\right)\sin\theta(t)=0$
Any idea? Thank you

2. ## Re: Proof that this sine equation isn't solvable

Is \displaystyle \begin{align*} \theta \end{align*} a function of \displaystyle \begin{align*} t \end{align*}?

3. ## Re: Proof that this sine equation isn't solvable

$\theta$ is a function of t.My idea was to use Laplace transorm on the equation, but I am not able to.