如题所述
tan2a=2tana/[1-(tana)^2]
推导:
tan2a=tan(a+a)=(tana+tana)/(1-tanatana)
=2tana/[1-(tana)^2]
注:tan(A+B) = (tanA+tanB)/(1-tanAtanB)
相关两角和公式:
sin(A+B) = sinAcosB+cosAsinB
cos(A+B) = cosAcosB-sinAsinB
tan(A+B) = (tanA+tanB)/(1-tanAtanB)
cot(A+B) = (cotAcotB-1)/(cotB+cotA)
推导:
tan2a=tan(a+a)=(tana+tana)/(1-tanatana)
=2tana/[1-(tana)^2]
注:tan(A+B) = (tanA+tanB)/(1-tanAtanB)
相关两角和公式:
sin(A+B) = sinAcosB+cosAsinB
cos(A+B) = cosAcosB-sinAsinB
tan(A+B) = (tanA+tanB)/(1-tanAtanB)
cot(A+B) = (cotAcotB-1)/(cotB+cotA)
温馨提示:答案为网友推荐,仅供参考