Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumIf $\varphi$ is the angle between the lines $a x^{2}+2 h x y+b y^{2}=0$,then the angle between the lines $x^{2}+2 x y \sec \theta+y^{2}=0$ is
- A$\theta$
- B$2 \theta$
- C$\frac{\theta}{2}$
- D$3 \theta$
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