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a) evaluate the directional derivative of z=F(x,y) = sin(xy) in the direction of u=(1,-1) at the...

a) evaluate the directional derivative of z=F(x,y) = sin(xy) in the direction of u=(1,-1) at the point (0,pi/2)

b) Determine the slope of the tangent line

c) State the tangent vector

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