Prove that at (x, y, z) the point of intersection of three confocals +² y² and + b- + -x-² a² + H he osculating plane of the curve = 1 + 1,² z² + 6² +μ c² +μ = 1, Σ a² + 2 a² + 2) + of intersection of the first two is given by ¸x x¡₁ (a² + µ) a² = 1 + b² +2 c²² +2 = 1

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