indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\sin 2x}{{{\sin }^{4}}x+{{\cos }^{4}}x}dx=}$

1) ${{\cot }^{-1}}({{\tan }^{2}}x)+c$

2) ${{\tan }^{-1}}({{\tan }^{2}}x)+c$

3) ${{\cot }^{-1}}({{\cot }^{2}}x)+c$

4) ${{\tan }^{-1}}({{\cot }^{2}}x)+c$

Solution:

Explanation: No Explanation

Integration by substitution

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