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

1884 261 Inverse Trigonometric Functions Report Error

A

$\frac{527}{625}$

38%

B

$- \frac{527}{625}$

25%

C

$π - \frac{527}{625}$

12%

D

$\frac{24}{25}$

25%

Solution:

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