/ /1\ /1\ \
| sinh|-| 6*cosh|-| / /1\\ / 2 \ |
| /1\ \z/ \z/ | cosh|-|| | z 3*z | /1\|
|6*sinh|-| + ------- + --------- / z \ | /1\ \z/| 6*|3 + -------- - -----|*sinh|-||
| \z/ 2 z / 3 2 \ 3*|-3 + -----|*|2*sinh|-| + -------| | 2 1 + z| \z/|
| z | z 3*z 3*z | /1\ \ 1 + z/ \ \z/ z / \ (1 + z) / |
-|------------------------------- + 6*|-1 + -------- - -------- + -----|*cosh|-| + ------------------------------------ + --------------------------------|
| z | 3 2 1 + z| \z/ z z |
\ \ (1 + z) (1 + z) / /
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1 + z