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If int(0)^(oo)e^(-x^(2))dx=(sqrtpi)/(2),...

If `int_(0)^(oo)e^(-x^(2))dx=(sqrtpi)/(2)," then " int_(0)^(oo)e^(-ax^(2))dx,agt0` is

A

`(sqrtpi)/(2)`

B

`(sqrtpi)/(2a)`

C

`2(sqrtpi)/(a)`

D

`(1)/(2)sqrt((pi)/(a))`

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