Q. The value of $(\frac{π}{4} - cos^{- 1} \frac{4}{5})$ is equal to

1638 270 Inverse Trigonometric Functions Report Error

A

$\frac{1}{5}$

19%

B

$\frac{1}{7}$

20%

C

$\frac{2}{5}$

40%

D

$\frac{2}{7}$

21%

Solution:

$\frac{1}{7}$