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The area enclosed by the curves: y=sin x...

The area enclosed by the curves: y=sin x+ cos x and y=cos x- sin x| over the interval `[0,pi/2]` is:

A

`4(sqrt2-1)`

B

`2sqrt2(sqrt2-1)`

C

`2(sqrt2+1)`

D

`2sqrt2(sqrt2+1)`

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