definite-integral

Question: $\int_{0}^{\pi /2}{\sqrt{\cos \theta }{{\sin }^{3}}\theta }\,d\theta =$



1) $\frac{20}{21}$
2) $\frac{8}{21}$
3) $\frac{-20}{21}$
4) $\frac{-8}{21}$
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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