Mark the tick against the correct answer in the following:
Question:

Mark the tick against the correct answer in the following:

Range of $\cos ^{-1} x$ is

A. $[0, \pi]$

B. $\left[0, \frac{\pi}{2}\right]$

C. $\left[\frac{-\pi}{2}, \frac{\pi}{2}\right]$

D. None of these

 

Solution:

To Find: The range of $\cos ^{-1} x$

Here,the inverse function is given by $y=f^{-1}(x)$

The graph of the function $y=\cos ^{-1}(x)$ can be obtained from the graph of

$Y=\cos x$ by interchanging $x$ and $y$ axes.i.e, if $(a, b)$ is a point on $Y=\cos x$ then $(b, a)$ is the point on the function $y=\cos ^{-1}(x)$

Below is the Graph of the range of $\cos ^{-1}(x)$

From the graph, it is clear that the range of $\cos ^{-1}(x)$ is restricted to the interval

$[0, \pi]$

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