pair-st-lines

Question: The angle between the lines represented by the equation $a{{x}^{2}}+xy+b{{y}^{2}}=0$ will be ${{45}^{o}}$, if



1) $a=1,b=6$
2) $a=1,b=-6$
3) $a=6,b=1$
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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