MCQ
$\cos ^{-1} \frac{1-x^2}{1+x^2}=$
  • A
    $2 \cos ^{-1} x$
  • B
    $2 \sin ^{-1} x$
  • $2 \tan ^{-1} x$
  • D
    $\cos ^{-1} 2 x$

Answer

Correct option: C.
$2 \tan ^{-1} x$
(C)

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