Trigonometry Examples

$\arctan (\frac{x \sin (y)}{1 - x \cos (y)}) - \arctan (\frac{x - \cos (y)}{\sin (y)})$

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$\arctan (\frac{x \sin (y)}{1 - x \cos (y)}) - \arctan (\frac{x - \cos (y)}{\sin (y)})$