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Published byMarissa Prow Modified over 2 years ago

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Integration by Parts

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Integration By Parts Start with the product rule: This is the Integration by Parts formula.

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The Integration by Parts formula is a “product rule” for integration. u differentiates to zero (usually). v’ is easy to integrate. Choose u in this order: LIPET Logs, Inverse trig, Polynomial, Exponential, Trig

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Example 1: polynomial factor LIPET

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Example 2: logarithmic factor LIPET

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This is still a product, so we need to use integration by parts again. Example 3: LIPET

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The Integration by Parts formula can be written as:

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Example 4: LIPET This is the expression we started with!

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Example 4 continued … LIPET

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Example 4 continued …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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This is still a product, so we need to use integration by parts again. Example 3: LIPET This is easier and quicker to do with tabular integration!

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Acknowledgement I wish to thank Greg Kelly from Hanford High School, Richland, USA for his hard work in creating this PowerPoint. http://online.math.uh.edu/ Greg has kindly given permission for this resource to be downloaded from www.mathxtc.com and for it to be modified to suit the Western Australian Mathematics Curriculum. www.mathxtc.com Stephen Corcoran Head of Mathematics St Stephen’s School – Carramar www.ststephens.wa.edu.au

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