Posted by Wes on Thursday, April 22, 2010 at 8:54pm.
Always ask yourself,
1. What quadrant is the angle in? That determines the ± according to the CAST rul
2. "How far is it to the x-axis"?
sin 120° = sin60
cos150° = -cos 30
tan 280° = -tan 80°
Sin (180 - A) = sin A. (angle in degrees)
sin 120 = sin (180 - 60) = sin 60
Cos (180 - A) = - cos A
cos 150 = cos (180 - 30) = - cos 30
tan (360 - A) = - tan A,
tan 280 = tan (360 - 80) = - tan 80
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