For the given $3$D stress state at a point:

$($a$)$ sketch the Mohr's circles in the $3$D case,

$($b$)$ ealculate all principal stresses in the $3$D case $({}_1,{}_2,{}_3)$ and show them on the Mohr's

circles,

$($c$)$ calculate the absolute maximum shear stress in the $3$D case tabs$,$inax and show it on the Mohr's

circles.