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Q: ArcTan[ Tan[ x ] ] = x


Suppose I really want Mma to set ArcTan[ Tan[ x ] ] = x, or 
ArcSin[ Sin[ x ] ] = x.  How do I do this?

Ron Elsner
ES84
NASA MSFC
Huntsville, AL 35812
elsner at avalon.msfc.nasa.gov



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