1.
P(3secθ,2tanθ),Q(3secϕ,2tanϕ)P(3\sec\theta,2\tan\theta), Q(3\sec\phi,2\tan\phi) on x2/9y2/4=1x^2/9-y^2/4=1, θ+ϕ=π/2\theta+\phi=\pi/2. Ordinate of intersection of normals is