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OpenStudy (anonymous):
Use the sum and difference identities to find the exact values of the sine, cosine, and tangent of the angle. 165 = 135 + 30
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OpenStudy (anonymous):
so you need to find each of these: sin(165) = cos(165) = tan(165) = as stated above, use the sum of 135 and 30 along with the sum rule for sine, cosine, tangent...
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