Integral

[sick remnant]

I need help solving this integral

[grizzled pumice]

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[wide widget]

Integrate by parts twice.

I assume you're finding the coefficients of trigonometric Fourier series?

[sick remnant]

yep

[wide widget]

Can you show the full problem?

[sick remnant]

more?

theres a 2/pi in front of the integral in the second one

i forgot to put it

[wide widget]

Alright.
To make this a bit simpler, try substituting u = x - π/2. You'll see that you can simplify a bit; at least, you'll be able to see two cases of n.

[sick remnant]

thx