Algebra Examples

$\cos (\frac{7 π}{15}) \cos (\frac{π}{5}) - \sin (\frac{7 π}{15}) \sin (\frac{π}{5})$

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$\cos (\frac{7 π}{15}) \cos (\frac{π}{5}) - \sin (\frac{7 π}{15}) \sin (\frac{π}{5})$