Trigonometry Examples

$\frac{\cos (x) \cos (y) - \sin (x) \sin (y)}{\sin (x) \cos (y) + \cos (x) \sin (y)}$

Step 1

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$\frac{\cos (x) \cos (y) - \sin (x) \sin (y)}{\sin (x) \cos (y) + \cos (x) \sin (y)}$