$\"\"$

Each term in the expansion of $\"\"$ in the form $\"\"$ .

$\"\"$

Find the term that doesnot contain variable $\"\"$ .

It means that power of the variable $\"\"$ can be zero in the general expansion of $\"\"$ term.

$\"\"$

$\"\"$ .

Since $\"\"$ , the second term contains no variable $\"\"$ .

Substitute $\"\"$ in the $\"\"$ .

$\"\"$

Term does not containing the variable $\"\"$ is $\"\"$ .

$\"\"$

Term does not containing the variable $\"\"$ is $\"\"$ .