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### 17 Cards in this Set

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 sin^2(x) + cos^2(x) = 1 tan^2(x) + 1 = sec^2(x) 1 + cot^2(x) = csc^2(x) sin(-x) = -sin(x) cos(-x)= cos(x) sin (x + y) = sin(x)cos(y) + cos(x)sin(y) cos (x + y) = cos(x)cos(y) - sin(x)sin(y) sin(x-y) = sin(x)cos(y) - cos(x) sin(y) cos(x-y) = cos(x)cos(y) +sin(x)sin(y) tan(x+y) = tan(x) + tan(y)/ 1 - tan(x)tan(y) tan(x-y) = tan(x) - tan(y) / 1 + tan(x)tan(y) sin(2x) = 2 sin(x)cos(x) A. cos(2x) = cos^2(x) - sin^2(x) C. cos(2x) = 2cos^2(x) - 1 B. cos(2x) = 1 - 2sin^2(x) cos^2(x) = 1 + cos(2x)/ 2 sin^2(x) 1 - cos(2x)/ 2