\(\int\limits_0^{\pi /2} {({{\cos }^3}x)dx = } \)

1.	\(\int\limits_0^{\pi /2} {({{\cos }^3}x)dx = } \)
A.	3/2
B.	2/3
C.	8/9
D.	8/13
Answer» C. 8/9

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\(\int\limits_0^{\pi /2} {({{\cos }^3}x)dx = } \)

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