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