SOLUTION: Use a sum or difference identity to find the exact value for the sine, cosine and tangent or 285 degrees.

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Question 869206: Use a sum or difference identity to find the exact value for the sine, cosine and tangent or 285 degrees.
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
285 = 360 - (30 + 45) degrees

sin(285) = sin(225 + 60)

(-sqrt2/2)(1/2) + (-sqrt2/2)(sqrt3/2) = -%28sqrt%282%29%2Bsqrt%286%29%29%2F4

cos(285) = cos(75) = cos(30+45)

(sqrt3/2)(sqrt2/2) - (1/2)(sqrt2/2) = %28sqrt%286%29+-+sqrt%282%29%29%2F4