# Reduce complex exponential expression

## Homework Statement

prove that:
1-exp(-iwt)= 2i*sin(wt/2)

## Homework Equations

exp(iwt)= cos (wt) + i*sin(wt)

## The Attempt at a Solution

I attempted to express the exponential into sum of cos and sin and considering t=2*t/2 in order to obtain an argument like (t/2) (using duplication expression of trigonometry theory).

phyzguy