Studied by 2 peoplesin2x
2sinxcosx
cos2x (sin & cos)
cos²x-sin²x
cos2x (cos)
2cos²x-1
cos2x (sin)
1-2sin²x
tan2x
2tanx/(1-tan²x)
cos(x/2)
±√(1+cosx)/2
sin(x/2)
±√(1-cosx)/2
tan(x/2) (cos sqrt)
±√(1-cosx)/(1+cosx)
tan(x/2) (sin cos)
sinx/(1+cosx)
tan(x/2) (cos sin)
(1-cosx)/sinx
Note
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