MCQ
$\int \frac{d x}{x^2+a^2}=$
- ✓$\frac{1}{a} \tan ^{-1} \frac{x}{a}+k$
- B$\frac{1}{a} \tan ^{-1}(x+a)+k$
- C$\sin ^{-1} \frac{x}{a}+k$
- D$\cos ^{-1} \frac{x}{a}+k$
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