pair-st-lines

Question: If the lines represented by the equation $a{{x}^{2}}-bxy-{{y}^{2}}=0$ make angles $\alpha $ and $\beta $ with the x-axis, then $\tan (\alpha +\beta )$=



1) $\frac{b}{1+a}$
2) $\frac{-b}{1+a}$
3) $\frac{a}{1+b}$
4) None of these
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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