The function is
.
Derivative of a function
is defined as
.
Apply derivative of the function.
\
.
The function is not defined when denominator is equal to zero.
\
Thus the function is not defined at
.
Therefore domain of the function
is
.

The function is not defined when denominator is equal to zero.
\
Thus the function is not defined at
.
Therefore domain of the function
is
.
\
.
The domain of the function
is
.
The domain of the function
is
.