\text{Abs}[z]=\sqrt{\left(\text{Cos}^2\left[\frac{x}{6}\right]+2 \text{Cos}\left[\frac{x}{6}\right] \text{Cos}\left[\frac{x}{3}\right]+\text{Cos}^2\left[\frac{x}{3}\right]+\text{Sin}^2\left[\frac{x}{6}\right]-2 \text{Sin}\left[\frac{x}{6}\right] \text{Sin}\left[\frac{x}{3}\right]+\text{Sin}^2\left[\frac{x}{3}\right]\right)}