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What is the reciprocal function?
The reciprocal function is:
##f(x)=1/x##
It's graph is as following: This is an example of asymptote.
Since ##x## can take all values except ##0## for ##f(x)## to be defined, : ##R-{0}##, i.e., all real numbers except 0. : ##R-{0}##, i.e., all real numbers except 0.