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In article <DEKnsy.AsC at wri.com>, Jack Goldberg <jackgold at math.lsa.umich.edu> wrote: > > I am keenly interested in how one should >handle ArcSin[Sin[x]]. <snip> > A wierd memory of mine is that my tenth grade trig book long ago created a Sin function, separate and appart from the sin function, by restricting the domain. Given mathematica's capitalization schemas, this is consistent. I didn't understand the reference to Log[Exp[x]], it doesn't seem to be a parallel situation. In what cases is Log[Exp[x]]<>x ?