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Question #49,274

Q.Let P(a sec θ, b tan θ) and Q (a sec φ, b tan φ), where 2 π θ + φ = θ + φ = θ + φ = θ + φ = be two points on the hyperbola 2 2 x y a b − − = 1. If (h, k) is the point of intersection of the normal at P and Q then k is equal to