MCQ
$7 \int \frac{d x}{1+49 x^2}=$
  • A
    $\tan ^{-1}(49 x)+k$
  • $\tan ^{-1}(7 x)+k$
  • C
    $7 \tan ^{-1}(49 x)+k$
  • D
    $\tan ^{-1} x+k$

Answer

Correct option: B.
$\tan ^{-1}(7 x)+k$
B

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