Question: b) Define gradient of a scalar valued function. Find the directional derivative of the surface f = xy +yz' at P (2, -1, 1)

b) Define gradient of a scalar valued function. Find the directional derivative

b) Define gradient of a scalar valued function. Find the directional derivative of the surface f = xy +yz' at P (2, -1, 1) along the 3 direction of normal to the surface xlog z - y+4 = 0 at the point (1, 1, 1).

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