Q. $cos (2 cos^{- 1} (7/25)) =$

1786 219 Inverse Trigonometric Functions Report Error

A

$\frac{527}{625}$

36%

B

$- \frac{527}{625}$

29%

C

$π - \frac{527}{625}$

7%

D

$\frac{24}{25}$

29%

Solution:

Apply $2 cos^{- 1} x$ formula