\"\"

\

Binomial theorem :

\

\

\"\"

\

\"\"

\

The expression is \"\".

\

Using binomial theorem:

\

\"\"

\

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\".

\

\"\".

\

Therefore, the expansion of \"\" is \"\".

\

\"\"

\

The expansion of \"\" is \"\".