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Notation of physical constants

If you want to use a physical constants inside Xcas, put it's name between two characters _ ("underscore"). Don't confuse physical constants with symbolic constants, for example, e,$ \pi$ are symbolic constants as _c_,_NA_ are physical constants.
Input :
Output speed of light in vacuum :
Input :
Output Avogadro's number :

giac documentation written by Renée De Graeve and Bernard Parisse