Consider a function $f(x,y)$ at the point $(2, 4)$.
At that point the function has directional derivatives:
$\frac{2}{\sqrt{25}}$ in the direction (parallel to) $(3, 4)$, and
$\frac{5}{\sqrt{29}}$ in the direction (parallel to) $(2, 5)$. The gradient of $f$ at the point $(2, 4 )$ is
$($, $)$.