It is quite simple, its just uv-? v dv, where you have to pick (u) and v is the intregal of the other part. For example (?x^2sinxdx) u=x^2 and v=? of sinx which is of course -cosx. plug it in and you'll have your answer :)
The integral of product of 2 functions is equal to the difference betn the product of first function n derivative second function and the intergral of product of integral of second function and derivative of the first function..
(first func multipied by integral of second) ---- [INTEGRAL of (integral of second func multiplied by derivative of the first)]
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