Algebra Examples

$\cos (\frac{2 π}{5}) \cos (\frac{7 π}{20}) - \sin (\frac{2 π}{5}) \sin (\frac{7 π}{20})$

Step 1

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$\cos (\frac{2 π}{5}) \cos (\frac{7 π}{20}) - \sin (\frac{2 π}{5}) \sin (\frac{7 π}{20})$