Example
Suppose the temperature at each point of a metal plate is given by
T(x,y)=Exp[x]Cos[y] + Exp[y]Cos[x].
In what direction does the temperature increase most rapidly at (0,0)? What is
the rate of increase?
T[x_,y_]:=Exp[x]*Cos[y] + Exp[y]*Cos[x]
grad2[T][x,y]
grad2[T][x,y]/.{x->0,y->0}
Answer:
Answer: ...
Up to Rate of Change and Gradient