evaluate having a limit

pls help on the problem above, thanks.

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- April 9th 2012, 03:40 AMlawochekeldefinite integral!
evaluate having a limit

pls help on the problem above, thanks. - April 9th 2012, 03:45 AMProve ItRe: definite integral!
- April 9th 2012, 03:54 AMprincepsRe: definite integral!

Now , use reduction formula for cosine several times . - April 9th 2012, 04:28 AMProve ItRe: definite integral!