Let P (x,y) denote the point where the terminal side of angle http://online.sdccd.edu/webct/Relati...02_mc014-2.jpg (in standard position) meets the unit circle. Evaluate the six trigonometric functions of http://online.sdccd.edu/webct/Relati...02_mc014-3.jpg.

P is in quadrant III and y=-3/4.

Is sine -3/4??? If not, how do I find sine? I am very confused. Thanks so much.