Let z = (1+z)√√/50 — x² − y². - (A) Calculate the equation of the tangent plane at x = 3, y = 4. (B) Calculate the equation of the tangent plane at x = -4, y = 3. (C) Calculate the equation of the tangent plane at x = 0, y = 0. (D) Calculate the point of intersection of those three tangent planes.

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