Integrate - Solve \int3^x\cos x\,dx w/ Partial Integration

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Government$

Homework Statement

Integrate [itex]\int3^x\cos x\,dx[/itex]

It has to be done using partial integration.

I don't know what should be u?

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pongo38

What choices do you have?

vela

You're just going to have to try stuff out and see how it works out.