November 2019 2 190 Report
Ada yang tahu nilai ini berapa

\sum\limits^{n}_{i=0}{\cos{\frac{\pi\,i}{n}}}=...\\\sum\limits^{n}_{i=0}{\sin{\frac{\pi\,i}{n}}}=...\\\sum\limits^{n}_{i=0}{\cos{\frac{2\pi\,i}{n}}}=...

Ini untuk persiapan nanti kalau mau mencari jumlah riemann.

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