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和差公式:
cos(x-y)=cosxcosy+sinxsiny
cos(x+y)=cosxcosy-sinxsiny
sin(x+y)=sinxcosy+cosxsiny
sin(x-y)=sinxcosy-sinxcosy
tan(x-y)=tanx-tany/1+tanxtany
tan(x+y)=tanx+tany/1-tanxtany
二倍角公式:
sin2x=2sinxcosx
cos2x=cos^2x-sin^2x=1-2sin^2x=2cos^x-1
tan2x=2tanx/1-tan^2x
cos(x-y)=cosxcosy+sinxsiny
cos(x+y)=cosxcosy-sinxsiny
sin(x+y)=sinxcosy+cosxsiny
sin(x-y)=sinxcosy-sinxcosy
tan(x-y)=tanx-tany/1+tanxtany
tan(x+y)=tanx+tany/1-tanxtany
二倍角公式:
sin2x=2sinxcosx
cos2x=cos^2x-sin^2x=1-2sin^2x=2cos^x-1
tan2x=2tanx/1-tan^2x
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