Six components of stress measured at a point are $\backslash$sigma xx $=14\mathrm{.}0$ MPa, $\backslash$sigma xy $=-0\mathrm{.}6$ MPa, $\backslash$sigma yy $=34\mathrm{.}8$ MPa,

$\backslash$sigma yz $=6\mathrm{.}0$ MPa, $\backslash$sigma zz $=16\mathrm{.}1$ MPa, $\backslash$sigma xz $=-2\mathrm{.}1$ MPa. Determine the principal stresses and their respective

directions.