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I've got a problem I've been working on for hours.

I get a clue;

If the integral (from zero to infinity) of e^(-x^2) is sqrt(pi)/2, what is

the integral (from zero to infinity) of e^(-bx^2)?

I've tried substitution, but I kind of got it wrong. If x = y/sqrt(b), I get the same integral as in the clue. But then I'm stuck with a 1/sqrt(b) which I cant get rid of. Anyone up for the challenge? Thanks..

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# Homework Help: Substitution in integral

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