[office-formula] IMSINH and IMCOSH are missing

Hi members,

the function IMCSCH and IMSECH are defined in terms of IMSINH and 
IMCOSH. But those are not defined. So you should either define IMCSCH 
and IMSECH directly, without using IMSINH and IMCOSH, or you should 
define IMSINH and IMCOSH too.

kind regards
Regina