Q. $co s^{- 1} [cos (2 co t^{- 1} (2 - 1))] =$

2287 227 Inverse Trigonometric Functions Report Error

A

$2 - 1$

19%

B

$1 + 2$

32%

C

$\frac{π}{4}$

24%

D

$\frac{3 π}{4}$

24%

Solution:

$co s^{- 1} (cos (2 t a n^{- 1} (2 + 1)))$
$= co s^{- 1} (cos (2.67 \frac{1 ^{\circ}}{2}))$
$= co s^{- 1} (cos 13 5^{\circ}) = \frac{3 π}{4}$