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sin2x+cos2x
1
sin (A ± B)
sinAcosB±sinBcosA
cos (A ± B)
cosAcosB∓sinAsinB
tan(A ± B)
tanA±tanB/1∓tanAtanB
sin2x
2sinxcosx
cos2x
cos2x-sin2x
cos2x
2cos2x-1
cos2x
1-2sin2x
tan2x
2tanx/1-tan2x
sec2x
1+tan2x
cosec2x
1+cot2x