Using the MATLAB command Taylor$\_$GUI on the Math Linux network, give $4$ significant digits of the exact error $f(x)-P_3(x)$ at $x=3\frac{}{4}$ of the Taylor polynomial $P_3(x)$ of degree $3$ about $a=\frac{}{2}$ of $f(x)$:$=e^{cos(x)}.$ Note: the command Taylor$\_$GUI exists only on the Math Linux network.