$\"\"$

The expression of complex numbers is $\"\"$ .

The expression of complex numbers in trigonometric form is $\"\"$ .

$\"\"$ (Write original expression trigonometric form)

$\"\"$ (Multiply moduli and add arguments)

$\"\"$ (Apply LCM rule: $\"\"$ )

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Use calculator)

$\"\"$ (Simplify) $\"\"$

The result of complex numbers is $\"\"$ .