Prove that at (x, y, z) the point of intersection of three confocals t² 1,² z² 2+₁b²+² c²+1 + + ,2 -Ł.² + = z² and + + + µ 6² +μ c²² +μ the osculating plane of the curve of intersection of the first two is given by xx₁₂(a² + \ a² (a² + 2) Σ = + = 1 = 1

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