Please solve problem $8\mathrm{.}2,$ thanks

$$

$$

$$

$8\mathrm{.}1$ Given an element with stresses as indicated in Fig. P$8\mathrm{.}11.$ Find:

a$.$ The major and minor principal stresses and the planes on which they act.

b$.$ The stresses on a plane inclined at $35$ from the horizontal.

c$.$ The maximum shear stress and the inclination of the plane on which it acts.

Figure P$8\mathrm{.}1$

Figure P$8\mathrm{.}1$ Full Alternative Text $$

$8\mathrm{.}2$ Work Problem $8\mathrm{.}1$ with the element rotated $30$ clockwise from the horizontal.