Trigonometry Examples

$\cos (\frac{π}{12}) \cos (- \frac{π}{6}) + \sin (\frac{π}{12}) \sin (- \frac{π}{6})$

Step 1

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$\cos (\frac{π}{12}) \cos (- \frac{π}{6}) + \sin (\frac{π}{12}) \sin (- \frac{π}{6})$