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QuestionAnswer
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))
Created by: kalensnyder
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