Trigonometry Examples

$\cos (\frac{π}{13}) + \cos (\frac{3 π}{13}) + \cos (\frac{5 π}{13}) + \cos (\frac{7 π}{13}) + \cos (\frac{9 π}{13}) + \cos (\frac{11 π}{13}) = \frac{1}{2}$

Step 1

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$\cos (\frac{π}{13}) + \cos (\frac{3 π}{13}) + \cos (\frac{5 π}{13}) + \cos (\frac{7 π}{13}) + \cos (\frac{9 π}{13}) + \cos (\frac{11 π}{13}) = \frac{1}{2}$