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Calculus Integration By Parts
Badlands, South Dakota Greg Kelly, Hanford High School, Richland, Washington Photo by Vickie Kelly, 1993
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6.3 Integration By Parts Start with the product rule:
This is the Integration by Parts formula.
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u differentiates to zero (usually).
dv is easy to integrate. u differentiates to zero (usually). The Integration by Parts formula is a “product rule” for integration. Choose u in this order: LIPET Logs, Inverse trig, Polynomial, Exponential, Trig
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Example 1: LIPET polynomial factor
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Example: LIPET logarithmic factor
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Example 4: LIPET This is still a product, so we need to use integration by parts again.
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Example 5: LIPET This is the expression we started with!
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Example 6: LIPET
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Example 6: This is called “solving for the unknown integral.” It works when both factors integrate and differentiate forever.
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A Shortcut: Tabular Integration
Tabular integration works for integrals of the form: where: Differentiates to zero in several steps. Integrates repeatedly.
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Compare this with the same problem done the other way:
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Example 5: LIPET This is easier and quicker to do with tabular integration!
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