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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^2lt=1` and `y^2lt=1-x}` is (1) `pi/2+4/3` (2) `pi/2-4/3` (3) `pi/2-2/3` (4) `pi/2+2/3`

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