I am wanting to know if there is any way that you can solve the following problem by just using your calculator?

Find Exact values using combination of $\displaystyle \frac{\pi}{6}$,$\displaystyle \frac{\pi}{6}$

1. $\displaystyle tan(\frac{\pi}{12})$

2. $\displaystyle sin(\frac{5\pi}{12})$

3. $\displaystyle cos(\frac{11\pi}{12})$

I am looking for a quick and easy way to solve these kinds of problems, just thought that someone could help me!!

Thanks