这些公式是基础公式吗?还是可以推导出来的!
1.和角公式
sin(x+y)=sinxcosy+cosxsiny(Sx+y)
cos(x+y)=cosxcosy-sinxsiny(Cx+y)
tan(x+y)=tanx+tany/1-tanxtany(Tx+y)
2.差角公式
sin(x-y)=sinxcosy-cosxsiny(Sx-y)
cos(x-y)=cosxcosys+inxsiny(Cx-y)
tan(x-y)=tanx-tany/1+tanxtany(Tx-y)
3.倍角公式
sin2x=2sinxcosx
cos2x=(cos^2)x-(sin^2)x=2(cos^2)x-1=1-2sin^2x
tan2x=2tanx/1-(tan^2)x
sin3x=3sinx-4(sin^3)x
cos3x=4(cos^3)x-3cosx
tan3x=3tanx-(tan^3)x/1-3(tan^2)x
4.降幂公式
(sin^2)x=1-cos2x/2
(cos^2)x=i=cos2x/2
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