indefinite-integration

Question: $\int{\frac{dx}{7+5\cos x}=}$

1) $\frac{1}{\sqrt{6}}{{\tan }^{-1}}\left( \frac{1}{\sqrt{6}}\tan \frac{x}{2} \right)+c$

2) $\frac{1}{\sqrt{3}}{{\tan }^{-1}}\left( \frac{1}{\sqrt{3}}\tan \frac{x}{2} \right)+c$

3) $\frac{1}{4}{{\tan }^{-1}}\left( \tan \frac{x}{2} \right)+c$

4) $\frac{1}{7}{{\tan }^{-1}}\left( \tan \frac{x}{2} \right)+c$

Solution:

Explanation: No Explanation

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