Q. $cos^{- 1} (\frac{5 - 1}{4}) =$

4378 253 Inverse Trigonometric Functions Report Error

A

$\frac{3 π}{10}$

20%

B

$\frac{2 π}{5}$

40%

C

$\frac{π}{5}$

26%

D

$\frac{π}{15}$

14%

Solution:

$\frac{5 - 1}{4} = cos 7 2^{\circ}$