1 -------- 2 cosh (x)
-2*sinh(x) ---------------- 2 cosh(x)*cosh (x)
/ 2 \ | 3*sinh (x)| 2*|-1 + ----------| | 2 | \ cosh (x) / ------------------- 2 cosh (x)
/ 2 \ | 3*sinh (x)| 8*|2 - ----------|*sinh(x) | 2 | \ cosh (x) / -------------------------- 3 cosh (x)