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# integration watch

1. I am trying to do:

So I am doing this by parts. I know that the integral of e^-x^2 is but if I let dv= can I integrate it to get v= when using integration by parts?
2. Write the integrand as {x}*{xe^(-x^2)}: the second term can be elementarily integrated and so using integration by parts will leave you with something you know.
3. (Original post by Glutamic Acid)
Write the integrand as {x}*{xe^(-x^2)}: the second term can be elementarily integrated and so using integration by parts will leave you with something you know.

But would xe^-(x^2) not need integration by parts itself?
4. (Original post by Big_Sam)
But would xe^-(x^2) not need integration by parts itself?
No you just need substitution/recognition for this
Use the substitution u=x^2

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