MCQ
$\int \frac{d x}{a^2+x^2}=$
- A$\frac{1}{a} \tan ^{-1} \frac{a}{x}+C$
- B$\tan ^{-1} \frac{x}{a}+C$
- ✓$\frac{1}{a} \tan ^{-1} \frac{x}{a}+C$
- D$\frac{1}{a} \tan ^{-1} x+C \quad$
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