MCQ
$\int \frac{d x}{x^2+4}=$
- A$\frac{1}{2} \sin ^{-1} \frac{x}{2}+k$
- B$\frac{1}{2} \cos ^{-1} \frac{x}{2}+k$
- ✓$\frac{1}{2} \tan ^{-1} \frac{x}{2}+k$
- D$\tan ^{-1} x+k$
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