MCQ
$4 \tan ^{-1} \frac{1}{5}-\tan ^{-1} \frac{1}{239}=$
  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{\pi}{3}$
  • $\frac{\pi}{4}$

Answer

Correct option: D.
$\frac{\pi}{4}$
(D)

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