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The tangent to the cureve xy+ax+by=0 at ...

The tangent to the cureve `xy+ax+by=0` at (1, 1) makes an angle with X - axis is `tan^(-1)2` 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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