equation

I am making a calculation mistake in this one.....[2][2]

Eqn1:cot^{-1}(\frac{y}{\sqrt{1-x^{2}-y^{2}}})=2tan^{-1}\sqrt{\frac{3-4x^{2}}{4x^{2}}}-tan^{-1}\sqrt{\frac{3-4x^{2}}{x^{2}}}
Eqn2:sin^{-1}\frac{ax}{c}+sin^{-1}\frac{bx}{c}=sin^{-1}x
For the values of x satisfying eqn 2 ,the valuse of y in eqn 1 are????