Find the angle between the lines represented by x2+2xysecθ+y2=0x^2 + 2xy\sec\theta + y^2 = 0x2+2xysecθ+y2=0.
θ\thetaθ
2θ2\theta2θ
π−θ\pi - \thetaπ−θ
π−2θ\pi - 2\thetaπ−2θ