这是两角和正切公式
如果不记得,那么可由两角和正弦公式与两角和余弦公式推导.
tan(A+B)=sin(A+B)/cos(A+B)=[sinAcosB+cosAsinB]/[cosAcosB-sinAsinB]
分子分母同时除以cosAcosB得
tan(A+B)=(tanA+tanB)/(1-tanAtanB)
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