Question

Trigo help..where did I go wrong?
\LARGE If ~\sin^{-1}x+\cot^{-1}1/2=\frac{\pi}{2}~Find~x.

Answer 1

\[\LARGE If ~\sin^{-1}x+\cot^{-1}\frac{1}{2}=\frac{\pi}{2}~Find~x.\]

Answer 2

I did it like this..
\[\LARGE ~\cancel \sin^{-1}x+\cot^{-1}\frac{1}{2}=\cos^{-1}x+\cancel \sin^{-1}x\]

Answer 3

From here..cosx=1/sqrt(5)