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int(0)^(pi/2)e^(-x) sinx dx is...

`int_(0)^(pi/2)e^(-x) sinx ` dx is

A

`1+ e^((-pi)/(2))`

B

`(1+e^((-pi)/2))/(2)`

C

`1-e^((-pi)/(2))`

D

`(1-e^((-pi)/(2)))/(2)`

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