Hello! 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..