$\"\"$

The integral is $\"\"$ .

No, Substitution of $\"\"$ , $\"\"$ and $\"\"$ to obtain $\"\"$ is not required.

Integral over the limits $\"\"$ , $\"\"$ and $\"\"$ , $\"\"$ .

When the square root is used to get from $\"\"$ to $\"\"$ , the integral splits into two integrals.

The first integral is $\"\"$ to $\"\"$ ans the second integral is $\"\"$ to $\"\"$ .

$\"\"$

No, Substitution of $\"\"$ , $\"\"$ and $\"\"$ to obtain $\"\"$ is not required.