How do you write the cosecant function of a negative number as the trigonometric function of a positive number? More specifically, how would you write $\csc(-2\pi/5)$ as the trigonometric function of a positive number?

**Hint:** Recall that $\sin(x)=\sin(x+2k\pi)$ for any integer $k$. Let $x=-2\pi/5$ and let $k=1$.