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I am putting this question in the PDE section because this was a question I came up while solving a PDE question.

Also, I figured that since this is not a straight homework question, I can post in this category. Mods, feel free to move this post to wherever you see fit. thanks.

I have looked everywhere, including the gredsteyin book of integrals and transforms to find this solution, but I wasn't able to find it. I am especially talking about the one from 0 to infinity as the bounds.

using mathcad just gives me a solution with infinity in it as a variable.

My professor will not tell me what it is, pretty much telling me that I am a fool for not being able to find it. @#%@#%@#%@

Also, another one that I couldn't find it for was:

integral of sin(ax)sin(ax) from 0 to an arbitrary number t?

Any help on this will be appreciated!

Thanks so much.

iqjump123