一站 Page > of 3 2. (b) of nonzero vector v is The directional derivative off (x, y) at the point (co, yo) in the direction If Vf(xo, Yo) 7 0, then among all unit vectors u, the one that yields the largest directional derivative Daf(xo, Yo) is (Of "Ox)f A Suppose that z is implicitly defined as a differentiable function of X and y through equation F(x, y, 2) = k, where k is a constant. Then we have F(x, y, z) F(x, y, z) F,(x, Y, z) F.(r, y, z) pue (P) also differentiable functions, then If z = f(x, y) is a differentiable function and x = g(t) and y = h(t) are dz dx Əz dy Əx dt ap fie The domain of function f (x, y) = e?cos(x+5y) is R?. Its range is [1/e, e]. 33 EEFE OCVIDO

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