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$$i=\sqrt{\cfrac{I}{S}}$$

$$F_{max}=S_y\cdot S/ \left[1+\cfrac{e\cdot c}{i^2}\cdot\sec\left(\cfrac{L\cdot β}{2\cdot i}\cdot\sqrt{\cfrac{F_{max}}{E\cdot S}}\right)\right]$$

$$F_{max}=S_y\cdot S/ \left[1+\cfrac{e\cdot c}{i^2}\right]$$