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Find the value of `tan^(-1)(x/y)-tan^(-1)((x-y)/(x+y))`

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Find the value of `tan^(-1)(x/y)-tan^(-1)((x-y)/(x+y))`
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We have,
`tan^(-1)(x/y)-tan^(-1)((x-y)/(x+y))`
`=tan^(-1)(x/y)-tan^(-1)(x-y)/(x+y)`.
`=tan^(-1)(x/y)-tan^(-1){(x/y-1)/(x/y+1))}`
`=tan^(-1)(1)=pi/4`.
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