Sum and Difference Identities
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tan(x/2)
(1 - cosx)/sinx sinx/(1 + cosx)
sin(2x)
2sinxcosx
tan(2x)
2tanx/(1-tan(squared)x)
cos(2x)
cos(squared)x - sin(squared)x 1-2sin(squared)x 2cos(squared)x - 1
cos(x-y)
cosxcosy + sinxsiny
cos(x+y)
cosxcosy - sinxsiny
cos(x/2)
plus or minus the square root of (1 + cosx)/2
sin(x/2)
plus or minus the square root of (1 - cosx)/2
sin(x+y)
sinxcosy + cosxsiny
sin(x-y)
sinxcosy - cosxsiny
tan(x+y)
tanx + tany/(1-tanxtany)
tan(x-y)
tanx - tany/(1+tanxtany)
