Evaluate of each of the following trigonometric expressions.  

1. $\csc\left(\frac{5\pi}{3}\right)$ 

   Step (a):

   $\frac{1}{\sin\left(\frac{5\pi}{3}\right)}$

2. $\cos\left(\frac{33\pi}{4}\right)$ 

   Hint (b):

   In radians the following angles are equivalent.

   $\frac{33\pi}{4}=\frac{33\pi}{4}-8\pi=\frac{\pi}{4}$

3. $\cot\left(-\frac{\pi}{6}\right)$ 

   Step (c):

   $\frac{1}{\tan\left(-\frac{\pi}{6}\right)}$

4. $\sec\left(\frac{3\pi}{2}\right)$ 

   Step (d):

   $\frac{1}{\cos\left(\frac{3\pi}{2}\right)}$