C166 library problem

Hi!
Who have expirence with C166 math library.
I have a grate and interesting problem with using Sin,Cos, Asin, Acos ant etc.
Asin work only in one point asin(1)=1.57, but all others break program to trap 0A (Illegal Word Operand Access Flag).
I use sqrt from library and everything is OK.
There are no problem with stak, I checked it with interupt routine. Also OK with RAM and ROM volume.
Help who know anything abt library problem.
Thank you

Jury

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