What is the solution to ΣΣ(sinx)(cosx)?

[abhaiitg]

what is the solution to this ?
∞∞
ΣΣ(sinx)(cosx)=??
00

 

[Xevarion]

Your question isn't clear. What variables are you summing over? And where do those appear in the summand?

 

[colby2152]

Your question isn't clear. What variables are you summing over? And where do those appear in the summand?

Are one of the trig functions supposed to be a function of y?

 

[HallsofIvy]

Since there was no y mentioned in the entire post, apparently not! But Xevarion's point is more than that. Typically "x" (or "y") in a function represents a continuous variable- but the sums must be over discrete indicies.

Perhaps it was
\sum_{n= 0}^\infty \sum_{m= 0}^\infty sin(n)cos(m)
that was intended. But the only way we will know for sure is if abhaaiitg tells us!

 

[abhaiitg]

yeah it was as u think

 

[Xevarion]

That sum doesn't converge. There are arbitrarily large $m, n$ with $|\sin(n)\sin(m)|$ close to 1.