Q. $cos [cot^{- 1} (- 3) + \frac{π}{6}] =$

7718 228 KCETKCET 2021Inverse Trigonometric Functions Report Error

A

0

20%

B

1

22%

C

$\frac{1}{2}$

25%

D

$- 1$

33%

Solution:

$cos (π - \frac{π}{6} + \frac{π}{6}) = cos π = - 1$