definite-integral

Question: $\int_{0}^{\pi /4}{\frac{dx}{{{\cos }^{4}}x-{{\cos }^{2}}x{{\sin }^{2}}x+{{\sin }^{4}}x}=}$

1) $\frac{\pi }{2}$

2) $\frac{\pi }{4}$

3) $\frac{\pi }{3}$

4) None of these

Solution:

Explanation: No Explanation

Fundamental definite integration Definite integration by substitution

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