If the angle between the pair of straight lines represented by the equation \( x^{2}-3 x y+\lamb...

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If the angle between the pair of straight lines represented by the equation \( x^{2}-3 x y+\lambda y^{2}+3 x-5 y+2=0 \), is \( \tan ^{-1} 3 \), where ' \( \lambda \) ' is a non-negative real number. Then; \( \lambda= \)
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