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(a) = Let f(x, y, z) = ln(xạy) + sin(yz). Find the directional derivative of f at the point P(1, 1, ) in the direction o
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(a) = Let f(x, y, z) = ln(xạy) + sin(yz). Find the directional derivative of f at the point P(1, 1, ) in the direction o
(a) = Let f(x, y, z) = ln(xạy) + sin(yz). Find the directional derivative of f at the point P(1, 1, ) in the direction of the vector 5 = (1,-1,1). = (5 marks) (b) Find and classify all the critical points of the function f(x, y) = 2y3 + 4.xy - 5y + 12x2. = (5 marks)
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