Question #e0a76

1 Answer
Nov 21, 2017

The value is #x#. See explanation.

Explanation:

#tan^{-1}x# is an inverse function of #tanx#, and for any function #f(x)# and its inverse #f^{-1}(x)# we have:

#f(f^{-1}(x))=x#

So the value of this expression is #x# for every #x# in the domain
#D=RR - {pi/2+kpi;k in ZZ}#