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have a ode that looks like this:

y'-xy=-x

so i find the particular integral which is e^-(x^2)/2

but then when i try to solve the eqn i have to do a integration by parts

ie:

ye^-(x^2)/2 = integrate[ -xe^-(x^2)/2 dx]

but when i do this integration by parts i end up with having to do another, and i never ends..

i know that there is some trick when dealing with simple x*e^x bla bla bla..

but don't know how to do it.. would someone please show me, or help me out?

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# Dirst order ODE's with x & expontials

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