[ ^ -1 (-1 7 )+ ^ -1 (-1 7 ) ]= - Vidyadip

MCQ

$\cos \left[\cos ^{-1}\left(\frac{-1}{7}\right)+\sin ^{-1}\left(\frac{-1}{7}\right)\right]=$

A
$\frac{-1}{3}$
✓
$0$
C
$\frac{1}{3}$
D
$\frac{4}{9}$

✓

Answer

Correct option: B.

$0$

(B) $\cos \left\{\cos ^{-1}\left(\frac{-1}{7}\right)+\sin ^{-1}\left(\frac{-1}{7}\right)\right\}=\cos \frac{\pi}{2}=0$

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