Equation Icon  A ∫ ∞ S = ---+--+ s(x) dx , 4Gren ¯A+√ - ( ) 1 e− μx (x sinh x − kx sinhkx ) s(x) = 2x-(cosh-x −-coshkx-) 1 + xcoth x − --(cosh-x-−-coshkx-)-- , (240 )