What is the value of $(\tan^{-1}\left(\frac{x}{y}\right) - \tan^{-1}\left(\frac{x - y}{x + y}\right))$, $(x, y > 0)$?

Question

$(\frac{\pi}{4})$

$(-\frac{\pi}{4})$

$(\frac{\pi}{2})$

$(-\frac{\pi}{2})$

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