Question

$\cos \left[2{\sin }^{-1}\frac{3}{4}+{\cos }^{-1}\frac{3}{4}\right]=$

• A. $\frac{3}{5}$
• B. $\frac{-3}{4}$
• C. does not exist
• D. $\frac{3}{4}$

Answer 1

Answer: (B)

$GE=cos\left[\frac{\pi }{2}+si{n}^{-1}\frac{3}{4}\right]=-sin\left(si{n}^{-1}\frac{3}{4}\right)=\frac{-3}{4}$