Question: Let f(x, y, z) = x - y + z, and f(x, y, z) = xy. What is the angle between the tangent planes

Let f(x, y, z) = x - y + z, and f(x,

Let f(x, y, z) = x - y + z, and f(x, y, z) = xy. What is the angle between the tangent planes for the level surfaces of f and f at the point (, e, 2)? Show your steps and reasoning.

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