Posted by Kate on Sunday, July 17, 2011 at 8:49am.
Determine the EXACT values of each of the following:
a) sin 240°
b) cos 135°

Math  Reiny, Sunday, July 17, 2011 at 9:07am
sin 240
1. where is the angle ? in quadrant III , so it is 
2. How far away from the xaxis ? 60° (the angle in standard position)
=  sin 60°
= = √3/2 , (from the 306090 triangle)
see if you can the second one in the same way.

Math  Reiny, Sunday, July 17, 2011 at 9:08am
small typo, answer should have said ....
=  √3/2
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