$\"\"$

\

The function is $\"integral$

\

$\"integral$ (Take LHS)

\

Let $\"u$

\

$\"d$ (Apply the derivative)

\

$\"d$ (The derivative power rule)

\

Lower limit:

\

When x = 0 then $\"u$

\

Upper limit:

\

When $\"x$ then $\"u$

\

\

$\"\"$

\

\

$\"integral$ (Substitute $\"u$ and $\"d$ )

\

$\"integral$

\

$\"equal$ (Take out constant term 2)

\

$\"2$ (Use part (a))

\

$\"equal$

\

$\"equal$

\

$\"equal$

\

$\"\"$

\

Therefore $\"integral$ . \ \