求证:tan(π/4+α)-tan(π/4-α)=2tan2α
求证:tan(a+π/4)+tan(a-π/4)=2tan2α
证明:tan(α+π/4)+tan(α+3π/4)=2tan2α
求证tan2分之α-1/tan2分之α=-tanα分之2
tan(α+π/4)=2,则cos2α+3sin^2α+tan2α=?
证明 tan(π/4+α)-cot(π/4+α)=2tan2α
化简tan2αtan(π/6-α)+tan2αtan(π/3-α)+tan(π/6-α)tan(π/3-α)=?请写下过
已知α=π/9,求值tanα+tan2α+根号3tanα×tan2α=( )
tan(π/4+α)=2010,那么1/cos2α+tan2α=
已知tanα=3,α属于(π/4,π/2)求sin2α,cos2α,tan2α的值
已知tanα=2,求sin(π/4+α)/cos(π/4+α)·tan2α的值
已知锐角α,β满足tan(α-β)=sin2β,求证2tan2β=tanα+tanβ
已知α∈(0,π),tanα=2,求sin4α(tan2α+1)