definite-integral

Question: The correct evaluation of $\int_{0}^{\pi }{\left| \,{{\sin }^{4}}x\, \right|\,dx}$ is



1) $\frac{8\pi }{3}$
2) $\frac{2\pi }{3}$
3) $\frac{4\pi }{3}$
4) $\frac{3\pi }{8}$
Solution: Explanation: No Explanation
Summation of series by definite Integration

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