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 Mar23 revised Solving separable differential equation added 2 characters in body Mar21 revised how do you solve $y''+2y'-3y=0$? added 205 characters in body; added 4 characters in body; added 88 characters in body; added 1 characters in body Mar20 comment Proving $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx = \dfrac{\sqrt \pi}{2}$ @Ross Millikan: I found it that way as well. The area of interest would span the entire first quadrant of the $\mathbb{R}^{2}$ coordinate system. I was justing getting reading to answer but I seen it was going to be the same, just a bit more detailed steps inbetween to show the conversion from cartesian to polar coordinates, but yes pretty much the same method of attack I would have took. +1 Mar20 revised how do you solve $y''+2y'-3y=0$? added 4 characters in body; deleted 7 characters in body Mar20 answered how do you solve $y''+2y'-3y=0$? Mar20 answered Solving separable differential equation Mar20 awarded Teacher Mar20 awarded Supporter Mar20 revised Calculate the unknown added 73 characters in body Mar20 revised Calculate the unknown added 1 characters in body Mar20 answered Calculate the unknown Mar20 awarded Editor Mar20 revised Eigenvalues of matrix added 10 characters in body Mar20 answered Eigenvalues of matrix