Integration Example: Integration by Parts #1

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Integral of x sin(3x).
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When I was in school we were never allowed to leave a sum of sines and cosine as is if they were taken from same function. Eg. Acos(3x) + Bsin(3x) should have always been converted to Ccos(3x+p). Where you describe how C & p are dependent on A & B. The reason being that that will give you the insight what the function really is.

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Bro good videos but I feel like you're being held in prison forced to make math videos with this background

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