Trig Integral Practice | MIT 18.01SC Single Variable Calculus, Fall 2010

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Uploaded by on Jan 7, 2011

Trig Integral Practice

Instructor: Joel Lewis

View the complete course: http://ocw.mit.edu/18-01SCF10

License: Creative Commons BY-NC-SA
More information at http://ocw.mit.edu/terms
More courses at http://ocw.mit.edu

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  • @AZNsensation2424 It's just the chain rule in reverse: when you take a derivative of cos^3(x), you get 3 * cos^2(x) * (-sin(x)), where the last factor comes from the chain rule. (Equivalently, make the substitution u = cos(x), du = -sin(x) dx.)

  • cool vid! I don't understand on the 2nd problem how you got ~sinx(2cos(^2)x-1)dx = to -(2/3)cos(^3)x + cosx + C. What I don't understand is what happened to the sinx, it looks like you distribute it but i don't see how 2sinxcos(^2)x would integrate to -(2/3)cos(^3)x. If you or someone else could explain, that would be great!

  • wait....this is awesome...how does this have like no views

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