- #1
jcurl
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Homework Statement
I'm in differential equations right now and we are about to start Laplace Transforms. Our homework is over complex numbers:
Simplify the following equation:
[itex] 1+cos(\theta)+cos(2\theta)+cos(3\theta)+...+cos(n\theta) [/itex]
Homework Equations
The Attempt at a Solution
I have no idea where to start. My only guess would be to do this: [itex] \sum_{i=0}^n cos(n\theta) [/itex] but I feel like that's way to easy and not what he is asking for.