Respuesta :

Given:

[tex]f(x)=\cos^{-1}x[/tex]

At x

[tex]=\frac{\pi}{2}[/tex]

Required:

To find the equation of the tangent line.

Explanation:

First we have to find the y-coordinate where

[tex]x=\frac{\pi}{2}[/tex]

Now

[tex][/tex]

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