find :

http://latex.codecogs.com/gif.latex?...dot cos5x\, dx

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- February 11th 2011, 10:10 PMdaporeintegral
- February 11th 2011, 10:13 PMChris11
What have you tried so far, have you tried any identities?

- February 11th 2011, 10:52 PMProve It
Hint:

- February 11th 2011, 11:13 PMdapore
Yes, I understand

By

http://latex.codecogs.com/gif.latex?...Rightarrow I=0 - February 11th 2011, 11:59 PMTheCoffeeMachine
Either using or putting gives:

Hence , thus .

More generally, if is even, then:

Thus - February 12th 2011, 04:56 AMKrizalid
this was a question of http://www.mathhelpforum.com/math-he...st-169383.html