tanA=2,tan(π/4+A)=

问题描述:

tanA=2,tan(π/4+A)=

tan(π/4+A)=【tan(π/4)+ tan(A)】/【1-tan(π/4)tan(A)】=(1+2)/(1-1×2) = -3

tan(π/4+A)=(tanπ/4+tanA)/(1-tanπ/4tanA)=(1+2)/(1-1*2)=-3

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