Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumThe number of real values of $\alpha$ for which the pair of lines represented by $(\alpha^2+12|\alpha|) x^2+6 x y+(18-21|\alpha|) y^2=0$ are at right angles to each other,is
- A$0$
- B$1$
- C$2$
- D$4$
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