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If the tangent to the curve xy+ax+by=0 a...

If the tangent to the curve `xy+ax+by=0` at (1,1) is inclined at an angle `Tan^-1 2` with x-axis, then

A

`a=1,b=2`

B

`a=1,b=-2`

C

`a=-1,b=2`

D

`a=-1,b=-2`

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The correct Answer is:
B
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