pair-st-lines

Question: If the lines represented by the equation $2{{x}^{2}}-3xy+{{y}^{2}}=0$ make angles $\alpha $and $\beta $ with x-axis, then ${{\cot }^{2}}\alpha +{{\cot }^{2}}\beta $=



1) 0
2) 3/2
3) 7/4
4) 5/4
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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