Problems and Solutions #046

written by jjycjn   2018.02.28 06:25

Problem #046

다음 등식을 증명하여라.

\[ \sum_{k=1}^{n} \sin(kx) = \frac{\cos(\frac{x}{2}) - \cos((n+\frac{1}{2})x)}{2 \sin(\frac{x}{2})} \]


Solution




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