Trigonometri analitik dengan notasi sigma.
[tex]\displaystyle \sum_{x=1}^{5}\cos\left [ \frac{(2x-1)\pi}{11} \right ][/tex]
[tex]\displaystyle \sum_{x=1}^{5}\cos\left [ \frac{(2x-1)\pi}{11} \right ][/tex]
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