$\"\"$

The expression is $\"open$ .

Write the expression into polar form.

Consider $\"z$ .

Multiply and divide by $\"square$ .

$\"z$

Compare the complex number inside the expresion $\"\"$ with $\"\"$ .

Here $\"\"$ .

Angle satisfies both the conditions is $\"\"$ .

$\"\"$ .

$\"\"$

De Moivre theorem: if $\"z$ is complex number then $\"z$ .

$\"\"$

$\"\"$ .

$\"\"$

The standard form is $\"minus$ .