Expand Using Sum/Difference Formulas cos(pi/5)cos(pi/20)-sin(pi/5)sin(pi/20)

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

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