\(\epsilon\left(a\right)=\ \frac{\alpha_{0}}{sin(\alpha_{0})}\left(\frac{\sqrt{2A}\ \left(\text{acos}\left(\frac{4Ft}{c_{2}}\right)-c_{1}\right)}{L_{p}\sqrt{\text{acos}\left(\frac{4Ft}{c_{2}}\right)-\frac{4Ftc_{1}}{c_{2}}}}-1\right)+1\) (10)