Q. $cos [S i n^{- 1} (- 4/5) - C o s^{- 1} (4/5)] = ....$

2391 234 Inverse Trigonometric Functions Report Error

A

$π /2$

15%

B

$- π /2$

17%

C

0

60%

D

$π$

8%

Solution:

$sin^{- 1} (- \frac{4}{5}) = - sin^{- 1} \frac{4}{5}$