First slide

Introduction to ITF

Question

If $\cos e c^{- 1} (\cos x)$ is defined

Easy

A

$x \in [- 1, 1]$
B

$x \in R$
C

$x - (2 n π + 1) \frac{π}{2}, n \in z$
D

$x = n π, n \in z$

Solution

$\cos e c^{- 1} (\cos x)$ $i s d e f i n e d o n l y i f$ $\cos x = \pm 1$
$\Rightarrow x = n π; n \in z$

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