Find the value of: tan^-1(frac{x}{y})-ta...

Find the value of: `tan^-1(frac{x}{y})-tan^-1(frac{x-y}{x+y})`

A

`frac{pi}{2}`

B

`frac{pi}{3}`

C

`frac{pi}{4}`

D

`-frac{3pi}{4}`

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