Integral of sin(x) sin(x+1) dx from 0 to 2pi.
Integration by parts: Integral u dv = uv – Integral v du
The Attempt at a Solution
My work has been attached as MyWork.jpg. I, basically, get 0 * integral_I_started_with = something_else instead of nonzero_constant * integral_I_started_with = something_else and, given that I've done this problem a multitude of times and failed (if I remember correctly, always with the same issue) and, I was hoping someone here could point out my mistake.
Any input would be greatly appreciated!
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