sin(x+y)=sinxcosy+cosxsiny
sin(x-y)=sinxcosy-cosxsiny
cos(x+y)=cosxcosy-sinxsiny
cos(x-y)=cosxcosy+sinxsiny
tan(x+y)=(tanx+tany)除以(1-tanxtany)
tan(x-y)=(tanx-tany)除以(1+tanxtany)
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