$\"\"$

The standard form of the complex number is $\"\"$ , where a and b are real numbers.

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

$\"\"$

$\"\"$ (The imaginary unit $\"\"$ )

$\"\"$

$\"\"$ (Apply formula: $\"\"$ )

$\"\"$

$\"\"$ (The imaginary unit $\"\"$ )

$\"\"$

$\"\"$ .

$\"\"$

The standard form is $\"\"$ .