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The directional derivative of the function $f(x,y)=x^2+y^2$ along a line directed from $(0,0)$ to $(1,1)$, evaluated at the point $x=1, y=1$ is

  1. $\sqrt{2}$
  2. $2$
  3. $2 \sqrt{2}$
  4. $4 \sqrt{2}$
in Calculus by (21.2k points) 4 64 208
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