Calculus Examples

$\cos (\frac{23 π}{30}) \cos (\frac{π}{15}) - \sin (\frac{23 π}{30}) \sin (\frac{π}{15})$

Step 1

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$\cos (\frac{23 π}{30}) \cos (\frac{π}{15}) - \sin (\frac{23 π}{30}) \sin (\frac{π}{15})$