化简tan(π/4+a)-tan(π/4-a)]
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化简tan(π/4+a)-tan(π/4-a)]
化简tan(π/4+a)-tan(π/4-a)]
化简tan(π/4+a)-tan(π/4-a)]
tan(π/4-A)
=(tanπ/4-tanA)/(1+tanπ/4tanA)
=(1-tanA)/(1+tanA)
tan(π/4+A)
=(tanπ/4+tanA)/(1-tanπ/4tanA)
=(1+tanA)/(1-tanA)
tan(π/4+a)-tan(π/4-a)]
=(1+ tanA)/(1-tanA) -(1-tanA)/(1+tanA)
=(1+ tanA)^2/ (1-tan^2A) -(1-tanA)^2/ (1-tan^2A)
=4 tanA/ (1-tan^2A).
(1+tana)/(1-tana)-(1-tana)/(1+tana)=4taba/(1-tan²a)
=sin4a/[4sin(π/4-a)sin(π/4-a)] =sin4a/[2-2cos(π/2-2a)] =sin4a/[2-2sin2a] 化简sin4α/[4sin*2(π/4-α)tan(π/4-α)]
化简tan(π/4+a)-tan(π/4-a)]
化简:[tan(π/4+a)-tan(π/4-a)]/tan2a-tan(π/4+a)tan(π/4-a)
化简:{[tan(π/4+a)-tan(π/4-a)]/tan2a} *tan(π/4+a)
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