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## Homework Statement

4{cos(13∏/6)+

*i*sin(13∏/6)}

= 4((√3/2)+(

*i*/2))

= 2√3+2

*i*

## Homework Equations

## The Attempt at a Solution

This is an example from my textbook. The part which I do not understand is how to convert the cos and sin of radians into those fractions. Any help is greatly appreciated.