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- If I let f be continuously differentiable on R^2, how do I prove that gradf = (fx,fy)?1. Show that f(t) is continuous at t=0 2. Use L'Hopital's rule to find the 1st and 2nd derivatives of f(t), evaluated at t =0Assume that x and y are differentiable functions of t. Find dx/dt given that x= -3 , y= -2 , and dy/dt = 4 y2- x2= -5
- suppose that x and y are both differentiable functions of t and are related by the given equation. Use implicit differentiation with respect to t to determine dy/dt in terms of x, y, and dx/dt. x2y2 = 2y3 + 1Assume that z = ƒ(x, y), x = g(t), y = h(t), ƒx(2, -1) = 3, and ƒy(2, -1) = -2. If g(0) = 2, h(0) = -1, g′(0) = 5, and h′(0) = -4, find dz /dt at t=0