Let f(x, y, z) = x cos z + y sin z and P = (−1, 1, 4). (a) (b) (c) at P. | Find the rate of change of f at P along the direction (1,4,-1). Find the minimum rate of change of f at P. Find an equation of the plane tangent to the surface f(x, y, z) = 0

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Q: ODE

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