(a)

The functions are and .

Find .

Definition of composite  function : .

.

(b)

Find .

.

(c)

In a rational function, denominator cannot be zero.

Domain of is where  and are non zero real numbers.

Domain of is all real numbers.

.

In a rational function, denominator cannot be zero.

Domain of is where , and are non zero real numbers.

In a rational function, denominator cannot be zero.

The domain of  is where , and are non zero real numbers.

(d)

If then is true.

(a) 

(b) 

(c) The domain of  is where , and are non zero real numbers.

     The domain of  is where , and are non zero real numbers.

(d)  If then is true.