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- Find the derivative of the function f(x, y, z) = 2x³ + zsin y at the point (-1, 1, 1) in the direction of 2i - j + 2k.Determine the directional derivative of f(x,y)=x² + x cos(3y) at (1,0) in the direction of (3, 4).3. Find the derivative of the function f(x, y, z) = xy³ + yz³ + zx³ at the point (-1, 2, 1) in the direction A = 3i+ 4j - 5k.