$(7)$ Write a MATLAB code that solves the

set of differential equations below. tin$[1,3]$ and

$x(1)=7,y(1)=-4,z(1)=1.$

$x^{\text{'}}+e^{-t}y=0$

$y^{\text{'}}-sin(t)z=0$

$z^{\text{'}}+cos(t)x=0$