Find a unit vector in the direction in which f(x, y) = 6 cos(x – 5y) decreases most rapidly at P and find the rate of change of f 2' 20. at P in that direction.

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A: Note: According to bartleby we have to answer only first question please upload the question…

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A: We know that; The expression for the directional derivative of the function g in the direction of A…

Q: The value of the instantaneous velocity at t = 1 is

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A: