\
The function
.
Derivative of a function
is defined as
.

The derivative of the given function.
\
Binomial expansion :
.

\

.
The domain of a function is all values of x, those makes the function mathematically correct.
\Since the function is a polynomial function, the domain of the function is all real numbers.
\Therefore domain of the function
is
.

The derivative function is a polynomial , the domain of the function is all real numbers.
\Therefore domain of the function
is
.
\
.
Domain of the function
is
.
Domain of the function
is
.
\
\ \ \