Direction ratios of a line are $-18,12,-4$Direction cosines of line are $-\;\frac{18}{\sqrt{18^2+12^2+4^2}}, \;\frac{12}{\sqrt{18^2+12^2+4^2}},-\;\frac{4}{\sqrt{18^2+12^2+4^2}}$Hence, direction cosines of line are $-\;\frac{9}{11}, \;\frac{6}{11},-\;\frac{2}{11}$.ORThe cartesian equation of the line which passes through the point $(-2,4,-5)$ and is parallel to the line $\;\frac{x+3}{3} = \;\frac{y-4}{-5} = \;\frac{z+8}{6}$ is $\;\frac{x+2}{3} = \;\frac{y-4}{-5} = \;\frac{z+5}{6}$.