MCQ
$\int \frac{d x}{x^2+81}=$
  • A
    $\tan ^{-1} \frac{x}{9}+k$
  • $\frac{1}{9} \tan ^{-1} \frac{x}{9}+k$
  • C
    $9 \tan ^{-1} \frac{x}{9}+k$
  • D
    $\tan ^{-1}(x-9)+k$

Answer

Correct option: B.
$\frac{1}{9} \tan ^{-1} \frac{x}{9}+k$
B

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