1 - 2/(2 + exp(x))
2 1 - ------ x 2 + e
2.71828182845905^x/(2.0 + 2.71828182845905^x)
2.71828182845905^x/(2.0 + 2.71828182845905^x)
cosh(x) + sinh(x) --------------------- 2 + cosh(x) + sinh(x)
x (cosh(1) + sinh(1)) ------------------------ x 2 + (cosh(1) + sinh(1))
(cosh(1) + sinh(1))^x/(2 + (cosh(1) + sinh(1))^x)