The function is .

Step 1:

(1) Find .

Substitute in the function.

Step 2:

(2) Find .

Substitute in the function.

Step 3:

(3) Find .

Substitute in the function.

Step 4:

(4) Find .

From (1) : .

Solution :

(1) 

(2) 

(3)

(4)

Step 1:

(5) Find .

Substitute in the function.

Step 2:

(6)  Find .

Substitute in the function.

Step 3:

(7) Find .

From (1) : .

Step 4:

(8) Find .

Substitute in the function.

Solution :

(5) 

(6) .

(7) 

(8)