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cos(2x)
cos²x-sin²x = 1-2sin²x = 2cos²x - 1
sin(2x)
2sinxcosx
tan(2x)
(2tanx)/(1-tan²x)
sin(x/2)
√((1-cosx)/2)
cos(x/2)
√((1+cosx)/2)
tan(x/2)
√((1-cosx)/(1+cosx))
sin²x
(1-cos(2x))/2
cos²x
(1+cos(2x))/2
tan²x
((1-cos(2x))/(1+cos(2x))