Step 1: \ \

The expression is $\"\"$ . \ \

The general term in binomial expansion is $\"\"$ . \ \

Substitute $\"\"$ , $\"\"$ and $\"\"$ in general term. \ \

$\"\"$

Find the coefficient of $\"\"$ , by equating $\"\"$ with $\"\"$ .

$\"\"$ $\"\"$ . \ \

$\"\"$ \ \

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

$\"\"$

The coefficient of $\"\"$ is $\"\"$ . \ \

Solution: \ \

The coefficient of $\"\"$ is $\"\"$ . \ \