设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,求a+b的值

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设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,求a+b的值设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,

设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,求a+b的值
设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,求a+b的值

设tana=根号3(1+m),tan(-b)=跟号3(tanatanb+m),且a,b为锐角,求a+b的值
∵tana=√3(1+m),tan(-b)=√3(tanatanb+m),两式相减:
tana-(-tanb)=tana+tanb=√3(1-tanatanb)
∴tan(a+b)=(tana+tanb)/(1-tanatanb)=√3
又a、b为锐角
∴a+b=π/3

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解析:消去m,得tana+tanb=√3(1-tanatanb),即(tana+tanb)/(1-tanatanb)=√3,
∴tan(a+b)=√3,又a,b为锐角,则0<a+b<π,∴a+b=π/3