Hi , after a substitution with x=3 cos u the answer in the text gives the following...see image

I can't see how it tidies up to u cos u

thank you

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- April 10th 2012, 12:55 AMminicooper58integration substitution
Hi , after a substitution with x=3 cos u the answer in the text gives the following...see image

I can't see how it tidies up to u cos u

thank you - April 10th 2012, 01:01 AMProve ItRe: integration substitution
Could you please post all of the original question?

- April 10th 2012, 01:16 AMminicooper58Re: integration substitution
the question is.. by considering the substitution x=3cos u ,evaluateAttachment 23555

- April 10th 2012, 01:52 AMProve ItRe: integration substitution
- April 10th 2012, 01:57 AMbiffboyRe: integration substitution
The terms on the top are multiplied together so 3sinu cancels out.

- April 10th 2012, 02:04 AMprincepsRe: integration substitution