A verticle force $\displaystyle P=50N$ is applied to the ends of the $\displaystyle 0.6m$ cord AB and spring AC.

If the spring has an unstretched length of $\displaystyle 0.6m$, determine the angle $\displaystyle \theta$ for equilibrium.

Take $\displaystyle k=250Nm^{-1}$

I have try to resolve them and sum of F = 0,

but there are too many variables,

I cant solve it.