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Question

$The least value of (1 + s e c^{- 1} x) (1 + \cos^{- 1} x) is$

Moderate

Solution

$given expression is defind only for x=1 and x=-1$
$f (x) = 1 a n d f (- 1) = (1 + π) (1 + π) = {(1 + π)}^{2}$
$hence least value is 1$

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