indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\sin 2x}{1+{{\sin }^{2}}x}dx=}$

1) $\log \sin 2x+c$

2) $\log (1+{{\sin }^{2}}x)+c$

3) $\frac{1}{2}\log (1+{{\sin }^{2}}x)+c$

4) ${{\tan }^{-1}}(\sin x)+c$

Solution:

Explanation: No Explanation

Integration by substitution

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