problem $2.-$continue

Consider the velocity field vec$(v)=3a(x^2-y^2)hat(e{)}_x-6a(xy)hat(e{)}_y,$

$($e$)$ derive the expression of $D2$vec$(),$

$($f$)$ derive the expressions of derive the expressions of ${}_{xy},$

$($h$)$ write down the expression of

$($i$)$ expand the expression for div $($ vec$()),$

$($i$)$ write down the expression of dissipation function $(),$