Find the directional derivative of f(x, y) = = direction of Q(1,-1). NOTE: Enter the exact...

 

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Find the directional derivative of f(x, y) = = direction of Q(1,-1). NOTE: Enter the exact answer. Duf = 2. Find Duf at P. NOTE: Enter the exact answer. Duf = Duf f(x, y) = sin(8x - 5y); P(5,8); u= 3. Find the directional derivative of f(x, y, z) = in the direction from P to Q(1,5,0). NOTE: Enter the exact answer. 4x x+y - at P(4,0) in the Y x + 2 i 45 j at P(4,3,-3) Find the directional derivative of f(x, y) = = direction of Q(1,-1). NOTE: Enter the exact answer. Duf = 2. Find Duf at P. NOTE: Enter the exact answer. Duf = Duf f(x, y) = sin(8x - 5y); P(5,8); u= 3. Find the directional derivative of f(x, y, z) = in the direction from P to Q(1,5,0). NOTE: Enter the exact answer. 4x x+y - at P(4,0) in the Y x + 2 i 45 j at P(4,3,-3)