definite-integral

Question: $\int_{0}^{\pi /4}{\frac{4\sin 2\theta \,d\theta }{{{\sin }^{4}}\theta +{{\cos }^{4}}\theta }}=$

1) $\pi /4$

2) $\pi /2$

3) $\pi $

4) None of these

Solution:

Explanation: No Explanation

Fundamental definite integration Definite integration by substitution

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