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The area of the region described by A = ...

The area of the region described by `A = {(x,y) : x^(2)+y^(2) le 1` and `y^(2) le 1-x}` is :

A

`pi/(2)+4/(3)`

B

`pi/(2)-4/(3)`

C

`pi/(2)-2/(3)`

D

`-pi/(2)+2/(3)`

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The correct Answer is:
A
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