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Original Message (ID '143561') By Dimanche:
In Response To 'Re: Derivative of a real function gives Complex...' --------- Oh thank you guys! I have also found quite similar problem discussed here: http://www.mofeel.net/1164-comp-soft-sys-math-mathematica/11211.aspx The trick was to use ComplexExpand. So, now everything works. Thanks again! Dimanche