Integration By Parts (c) 2014 joan s kessler distancemath.com 1 1.

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Presentation transcript:

Integration By Parts (c) 2014 joan s kessler distancemath.com 1 1

Suppose we want to integrate this function. Up until now we have no way of doing this. x, and sin(x) seem totally unrelated. If u(x) is a function and v(x) is another function we seem to have It almost seems like the reverse of the product rule. Let’s explore the product rule. (c) 2014 joan s kessler distancemath.com 2

Integration By Parts Start with the product rule: This is the Integration by Parts formula. (c) 2014 joan s kessler distancemath.com 3

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 (c) 2014 joan s kessler distancemath.com 4

Example 1: LIPET polynomial factor 5 (c) 2014 joan s kessler distancemath.com 5

Example 2: LIPET logarithmic factor 6 (c) 2014 joan s kessler distancemath.com 6

This is still a product, so we need to use integration by parts again. Example 3: LIPET This is still a product, so we need to use integration by parts again. (c) 2014 joan s kessler distancemath.com 7

This is the expression we started with! Example 4: LIPET This is the expression we started with! (c) 2014 joan s kessler distancemath.com 8

Example 5: LIPET (c) 2014 joan s kessler distancemath.com 9

Example 5 : This is called “solving for the unknown integral.” It works when both factors integrate and differentiate forever. (c) 2014 joan s kessler distancemath.com 10

More integration by Parts Ex 6. Let u = arcsin3x dv = dx v = x -18 -1 18 (c) 2014 joan s kessler distancemath.com 11

More integration by Parts Ex. 7 Let u = x2 du = 2x dx Form (c) 2014 joan s kessler distancemath.com 12

A Shortcut: Tabular Integration Tabular integration works for integrals of the form: where: Differentiates to zero in several steps. Integrates repeatedly. (c) 2014 joan s kessler distancemath.com 13

Compare this with the same problem done the other way: Alternate signs Compare this with the same problem done the other way: (c) 2014 joan s kessler distancemath.com 14

This is easier and quicker to do with tabular integration! Same Example : LIPET This is easier and quicker to do with tabular integration! (c) 2014 joan s kessler distancemath.com 15

Factor the answer if possible (c) 2014 joan s kessler distancemath.com 16

(c) 2014 joan s kessler distancemath.com 17

(c) 2014 joan s kessler distancemath.com

(c) 2014 joan s kessler distancemath.com 19

Factor the answer if possible (c) 2014 joan s kessler distancemath.com 20

Try (c) 2014 joan s kessler distancemath.com 21

+ - + - (c) 2014 joan s kessler distancemath.com 22

+ - + - (c) 2014 joan s kessler distancemath.com 23

+ - + - (c) 2014 joan s kessler distancemath.com

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