Expand Using Sum/Difference Formulas cos((11pi)/20)cos(pi/5)-sin((11pi)/20)sin(pi/5)

$\cos (\frac{11 π}{20}) \cos (\frac{π}{5}) - \sin (\frac{11 π}{20}) \sin (\frac{π}{5})$

Step 1

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$\cos (\frac{11 π}{20}) \cos (\frac{π}{5}) - \sin (\frac{11 π}{20}) \sin (\frac{π}{5})$