MCQ
$2 \tan ^{-1} \frac{1}{9}=$
  • $\tan ^{-1} \frac{9}{40}$
  • B
    $\tan ^{-1} \frac{2}{9}$
  • C
    $\tan ^{-1} \frac{1}{81}$
  • D
    $\tan ^{-1} \frac{5}{9}$

Answer

Correct option: A.
$\tan ^{-1} \frac{9}{40}$
A

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