$T h e d o m a i n o f f (x) = \frac{\cos e c^{- 1} x}{[x]} i s$

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$[- 1, 1]$

$R - (- 1, 1)$

$R - (0, 1)$

$R - [- 1, 1]$

answer is C.

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Detailed Solution

$\begin{array}{l} f (x) = \frac{\cos e c^{- 1} x}{[x]} i s d e f i n e d i f f \\ x \in (- \infty, 1] \cup [1, \infty) a n d [x] \neq 0 \\ \Rightarrow x \in [0, 1) \\ x \in R - (- 1, 1) \end{array}$

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