Use Matlab

Determine the nodal forces for $($a$)$ a linearly varying pressure on the edge of the triangular element shown in Figure by evaluating the surface integral. Assume the element thickness is equal to $0\mathrm{.}5$ in $.$

Let $\backslash (\backslash$mathrm$\{$E$\}=30\backslash$times $10^\{6\}\backslash$mathrm$\{$psi$\},\backslash$boldsymbol$\{$v$\}=0\mathrm{.}25\backslash ),$ and the element is fixed support at node $1.$ Calculate the principle stress and principle angles for this triangle.