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If tan^(-1) x + tan^(-1) y =(pi)/(4) the...

If `tan^(-1) x + tan^(-1) y =(pi)/(4)` then...

A

`x + y + xy = 1`

B

`x + y - xy = 1`

C

`x + y + xy + 1 = 0`

D

`x + y - xy + 1 = 0`

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The correct Answer is:
A
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