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Question | Answer |
---|---|
sin(x/2) | +/- √((1 - cosx)/2) |
cos(x/2) | +/- √((1 + cosx)/2) |
tan(x/2) | +/- √((1 - cosx)/(1 + cosx)) (1 - cosx)/sinx sinx/(1 + cosx) |
sin2(x) | 1/2[1 - cos(2x)] |
cos2(x) | 1/2[1 + cos(2x)] |
tan2(x) | (1 - cos(2x))/(1 + cos(2x)) |