# circular functions

• Nov 14th 2008, 12:10 PM
daydreembelievr
circular functions
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.
• Nov 15th 2008, 07:31 AM
skeeter
Quote:

Originally Posted by daydreembelievr
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.

yes ... $\sin{\theta} = -\frac{3}{4}$

draw a reference triangle in quad III and determine the other trig ratios.