Question: onsider the following theorem.Iffis a differentiable function ofx and y, then the directional derivative offin the direction of the unit vector u=cos()i+sin()j is Duf(x,y)=fx(x,y)cos()+fy(x,y)sin().Use the

onsider the following theorem.Iffis a differentiable function ofx and y, then the directional derivative offin the direction of the unit vector u=cos()i+sin()j is Duf(x,y)=fx(x,y)cos()+fy(x,y)sin().Use the theorem to find the directional derivative of the function atPin the direction ofv.f(x,y)=x3-y3,P(6,3),v= 22 (i+j)

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