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jacobi
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- May 22, 2013
- 58
Find \(\displaystyle \sum_{n=0}^\infty \frac{\cos(nx)}{2^n}\).
Find \(\displaystyle \sum_{n=0}^\infty \frac{\cos(nx)}{2^n}\).
Applying the Euler's identity...Find \(\displaystyle \sum_{n=0}^\infty \frac{\cos(nx)}{2^n}\).