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sin(2x) = 2sin(x)cos(x)
cos(2x) = 2cos^2(x) - 1
cos(2x) = 1 - 2sin^2(x)
cos(2x) = cos^2(x) - sin^2(x)
tan(2x) = 2tan(x) / 1 - tan^2(x)
sin(x+y) = sin(x)cos(y) + cos(x)sin(y)
sin(x-y) = sin(x)cos(y) - cox(x)sin(y)
cos(x+y) = cos(x)cos(y) - sin(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^2(x) = 0.5 - 0.5cos(2x)
cos^2(x) = 0.5cos(2x) - 0.5
i think they're all correct, havent had to think about any of it for 4months.. hope they are, that'd mean i'd have less to worry about this year
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