Hello,

I'm trying to show that , if y does not equal k (with y and k both being integers). I've tried using the trig identity for the product of sines. That gives , but I'm still stuck there.

Any ideas?

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- August 23rd 2012, 08:46 PMsumofsinesSum of Product of Sines
Hello,

I'm trying to show that , if y does not equal k (with y and k both being integers). I've tried using the trig identity for the product of sines. That gives , but I'm still stuck there.

Any ideas? - August 23rd 2012, 09:12 PMMaxJasperRe: Sum of Product of Sines
Your sum is equal to zero if y<>k and: