If the tangent to the curve \( x y+a x+b y=0 \) at \( (1,1) \) is i...

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If the tangent to the curve \( x y+a x+b y=0 \) at \( (1,1) \) is inclined at an angle \( \tan ^{-1} 2 \) with positive
\( \mathrm{P} \) \( x \)-axis in anticlockwise, then find \( a \) and \( b \) ?

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