A four ply symmetric \([0 / 90]_{\mathrm{s}}\) laminate has the following ply properties; ply thickness \(=0.25 \mathrm{~mm}\);

\[E_{1}=129 \mathrm{GPa}, \quad E_{2}=12.8 \mathrm{GPa}, \quad G_{12}=4.6 \mathrm{GPa}, \quad v_{12}=0.313\]
Determine

(a) the flexural modulus of the laminate, \(E_{\mathrm{f}}\), using laminated beam theory and

(b) the flexural modulus of the laminate, \(E_{\mathrm{f} x}\), using CLT.