Question: Consider the following theorem. If f is a differentiable function of x and y , then the directional derivative of f in the direction of

Consider the following theorem.
If f is a differentiable function of x and y, then the directional derivative of f in the direction of the unit vector u=cos()isin()j is Duf(x,y)=fx(x,y)cos()fy(x,y)sin(). Use the theorem to find the directional derivative of the function at P in the direction of vec(PQ).
f(x,y)=e7ysin(x),P(0,0),Q(5,1)
Consider the following theorem. If f is a

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