SOLUTION: How to determine the exact values of the sine, cosine, and tangent of an angle measuring 150° using a reference angle?

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Question 1191267: How to determine the exact values of the sine, cosine, and tangent of an angle measuring 150° using a reference angle?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Use the unit-circle to help think through. From 180 degrees, if decrease this by 30 degrees then this gives 150 degree. Same sine as for 30 degrees, but opposite of the cosine of 30 degree.