_________ \/ cosh(x)
sinh(x) ------------- _________ 2*\/ cosh(x)
2 _________ sinh (x) 2*\/ cosh(x) - ---------- 3/2 cosh (x) -------------------------- 4
/ 2 \ | 3*sinh (x)| |-2 + ----------|*sinh(x) | 2 | \ cosh (x) / ------------------------- _________ 8*\/ cosh(x)