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The plane region bounded by the curve y=...

The plane region bounded by the curve `y=sqrt(cosx), 0 le x le (pi)/(2)` and the lines `x=0,y=0` is rotated about x-axis. The volume of solid formed is :

A

a)`pi`

B

b) `pi^2`

C

c)`(pi)/(2)`

D

d) `(pi)/(4)`.

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The correct Answer is:
A
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