coth(x) 3
coth(x) -3 *log(3) ----------------- 2 sinh (x)
coth(x) / log(3)\ 3 *|2*cosh(x) + -------|*log(3) \ sinh(x)/ ------------------------------------- 3 sinh (x)
/ 2 2 \ coth(x) | log (3) 6*cosh (x) 6*cosh(x)*log(3)| 3 *|2 - -------- - ---------- - ----------------|*log(3) | 4 2 3 | \ sinh (x) sinh (x) sinh (x) / -------------------------------------------------------------- 2 sinh (x)