Algebra Examples

$\cos (\frac{14 π}{15}) \cos (\frac{23 π}{30}) + \sin (\frac{14 π}{15}) \sin (\frac{23 π}{30})$

Step 1

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$\cos (\frac{14 π}{15}) \cos (\frac{23 π}{30}) + \sin (\frac{14 π}{15}) \sin (\frac{23 π}{30})$