find Secant of 11pi/4
11pi/4=3pi/4 second quad
\(sec\frac{11\pi}{4}\\=sec\frac{3\pi}{4}\\=1\div cos\frac{3\pi}{4}\\ =1\div -cos(\pi-\frac{3\pi}{4})\\ =1\div -cos(\frac{\pi}{4})\\ =1\div (\frac{-1}{\sqrt2})\\ =-\sqrt2\)
