Q. Domain of $cos^{- 1} [x]$ is

1976 257 Inverse Trigonometric Functions Report Error

A

[-1,2]

B

[-1,2)

C

(-1,2]

D

None of these

Solution:

$0 \leq cos^{- 1} [x] \leq π, - 1 \leq [x] \leq 1$
$\Rightarrow - 1 \leq x < 2$
$\Rightarrow x \in [- 1, 2)$