# The modulus and amplitude of the complex number $[e^{3-i \pi/4}]^{3}$ is respectively
$\begin{array}{1 1}(1)e^{9},\frac{\pi}{2}&(2)e^{9},\frac{-\pi}{2}\\(3)e^{6},\frac{-3\pi}{4}&(4)e^{9},\frac{-\pi}{4}\end{array}$