## Algebra and Trigonometry 10th Edition

(0,1) cos($\frac{\pi}{2}$) = 0 sin($\frac{\pi}{2}$) = 1 tan($\frac{\pi}{2}$) = undefined
Using the unit circle when t = $\frac{\pi}{2}$, The (x,y) point is (0,1) Using the coordinate points: cos($\frac{\pi}{2}$) = 0 sin($\frac{\pi}{2}$) = 1 tan($\frac{\pi}{2}$) = undefined