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