Chapter 13.6, Problem 2QCE

Suppose that the differentiable function $f\left(x,y\right)$ has the property that

$f\left(2+\frac{s\sqrt{3}}{2},1+\frac{s}{2}\right)=3s{e}^s$

The directional derivative of $f$ in the direction of $\text{u}=\frac{\sqrt{3}}{2}\text{i}+\frac{1}{2}\text{j}$

at (2, 1) is $\text{\_\_\_\_\_\_}\text{.}$