Posted by sally on Monday, April 12, 2010 at 12:18am.
a cos 20
b cos (90-20) = cos 70
c sin (90 - -10) = cos -10 = sin 100
d 30 deg from x axis in quadrants 3 and 4 for -sin so below 210 and 330
e above 45 degrees in quadrant 1 and below 225 in quadrant 3
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