MCQ
$\tan \left[\tan ^{-1} \frac{1}{7}+\tan ^{-1} \frac{1}{13}\right]=$
  • $\frac{2}{9}$
  • B
    $\frac{9}{2}$
  • C
    $\frac{7}{9}$
  • D
    $\frac{9}{7}$

Answer

Correct option: A.
$\frac{2}{9}$
A

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