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# Recurrence Relation ~ Integration watch

1. Can someone give me a pointer on how to start this question? I tried integrating by parts using u = cos(x)^n but that doesn't help:

Attached ~
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2. (Original post by ViralRiver)
Can someone give me a pointer on how to start this question? I tried integrating by parts using u = cos(x)^n but that doesn't help:

Attached ~
rewrite the integrand as
3. (Original post by ViralRiver)
Can someone give me a pointer on how to start this question? I tried integrating by parts using u = cos(x)^n but that doesn't help:

Attached ~
Note that

Use IBP on the second integral with u=sin x.
4. (Original post by ben-smith)
rewrite the integrand as
It took me a while to parse this; surely would be clearer?
5. (Original post by DFranklin)
It took me a while to parse this; surely would be clearer?
probably.
I think I'm wrong anyway...
6. (Original post by ben-smith)
probably.
I think I'm wrong anyway...
You can definitely start from this point and get it out; it's the "standard" approach IMHO.
7. (Original post by ben-smith)
probably.
I think I'm wrong anyway...
It seems fine. (Nerd high five for D-operator though. )
8. (Original post by Xero Xenith)
It seems fine. (Nerd high five for D-operator though. )
I use it out of laziness tbh

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Updated: November 29, 2011
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