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By looking at the product rule for derivatives in reverse, we get a powerful integration tool. Since definite integrals are the net area between a curve and xaxis, we can sometimes use geometric formulas to find integrals. More free lessons at.
The basic idea of integral calculus is finding area under a curve. Here we walk through how to use a graphing calculator compute the integral found in last video. Introduction to integration by parts (kind of the reverseproduct rule).
Sometimes we can integrate rational functions by using the method of completing square in denominator and then integrating usubstitution o. Example using integration by parts. Practice this lesson yourself on khanacad.
To find it exactly, we can divide into infinite rectangles infinitely smal.