# Math Help - e^{ikx}

1. ## e^{ikx}

Is this true: |e^ikx|=|e^-ikx| = 1, and why?

2. ## Re: e^{ikx}

Hint For all $y\in\mathbb{R}$ we have $|e^{iy}|=|\cos y+i\sin y|=1$ .