\[\int_{0}^{\pi /2}{\sqrt{\cos \theta }{{\sin }^{3}}\theta }\,d\theta

1.	\[\int_{0}^{\pi /2}{\sqrt{\cos \theta }{{\sin }^{3}}\theta }\,d\theta =\]
A.	\[\frac{20}{21}\]
B.	\[\frac{8}{21}\]
C.	\[\frac{-20}{21}\]
D.	\[\frac{-8}{21}\]
Answer» C. \[\frac{-20}{21}\]

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\[\int_{0}^{\pi /2}{\sqrt{\cos \theta }{{\sin }^{3}}\theta }\,d\theta =\]

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