How does (Cos^2 x+1+Sin x)/(Cos^2 x + 3) simplify to (1+Sin x)/(2+Sin x)?
In calculus, and more generally in mathematical analysis, integration by parts is a rule that transforms the integral of products of functions into other (ideally simpler) integrals. The rule can be derived in one line by simply integrating the product rule of differentiation. ChaCha on!
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