Use the reference angle to find the exact value of tan ( - 11pi/4 )
\(\frac{-11\pi}{4}=\frac{-8\pi}{4}-\frac{3\pi}{4}=\frac{-3\pi}{4}=\frac{-3\pi}{4}+\frac{8\pi}{4}=\frac{5\pi}{4}=\pi+\frac{\pi}{4}\\ tan(\pi+\frac{\pi}{4})=tan(\frac{\pi}{4})=1\)
