E = E_{00} exp (- \frac{ω κ}{c} z) exp [i ω (t - n \frac{z}{c})]

${E=E_{00} \exp \bigg(- \frac{\omega \kappa}{c }z\bigg) \exp\bigg[i\omega \bigg(t-n \frac{z}{c}\bigg) \bigg]}$

Error