(1).

\

The expression is \"\".

\

\"\"

\

\"\"

\

\"\"

\

(2).

\

The expression is \"\".

\

\"\"

\

Apply Sum of Two Cubes : \"\".

\

\"\"

\

(3).

\

The expression is \"\".

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

(4).

\

The expression is \"\".

\

\"\"

\

\"\"

\

\"\"