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OpenStudy (anonymous):
Find the exact values of the sine, cosine, and tangent of the angle. 255=300-45
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OpenStudy (barrycarter):
You know sin 30 degrees, and can use half formula to get sin 15 degrees, and 255 = 270-15, so use difference of sins rule to get final answer. http://www.wolframalpha.com/input/?i=sin+255
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