复数 $z=-3\left(\cos \frac{4}{5} \pi-i \sin \frac{4}{5} \pi\right)$ 的三角表示式为
A. $\quad 3\left(\cos \frac{4}{5} \pi+i \sin \frac{4}{5} \pi\right)$
B. $\quad 3\left(\cos \frac{\pi}{5}-i \sin \frac{\pi}{5}\right)$
C. $\quad 3\left(\cos \frac{4}{5} \pi-i \sin \frac{4}{5} \pi\right)$
D. $\quad 3\left(\cos \frac{\pi}{5}+i \sin \frac{\pi}{5}\right)$