Standard answer for integral of cos(2deta)cos(ndeta)

  • Thread starter stan
  • Start date
  • #1
18
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Hi

does anyone knows the standard answer for

integral of cos(2deta)cos(ndeta) from 0 to 180 degress?

for instance for integral of sin(ndeta)sin(deta) 0 to 180 degress, when n=1, it is 90 degress and when n not equals 1, it is 0...

thanks
 

Answers and Replies

  • #2
dvs
19
0
Have you tried using integration by parts?
 
  • #3
Hurkyl
Staff Emeritus
Science Advisor
Gold Member
14,916
19
What's a "deta" or an "ndeta"? What's your variable of integration?

You might want to review your trig identities... there's one that makes this kind of integral really easy.
 

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