fig 1: 
solution:
Given:
= 
= 
= 
= 
……….(i)
Domain of the given function is given to be 
Also 
and 
From eq. (i), 
for all 
in domain and 
is an increasing function.
Show that (fig1) is an increasing function of x throughout its domain.
Show that (fig1) is an increasing function of x throughout its domain.