Asked by Jennifer
use the appropriate trig identity (sum and difference, half angle, double angle) to find the exact value. 1)cos 255 degrees
2) sin 165 degrees
3) tan 285 degrees
2) sin 165 degrees
3) tan 285 degrees
Answers
Answered by
bobpursley
isn't 255 = 180+75=270-15 which is 270-30/2?
isn't 165=180-30/2
isn't 285=270+30/2?
isn't 165=180-30/2
isn't 285=270+30/2?
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