已知sin(2α+β)=3sinβ,α≠kπ+π/2,α+β≠kπ+π/2,求证:tan(α+β)=2tanα
已知sinα=4sin(α+β),α+β≠kπ+π/2(k∈Z).求证tan(α+β)=sinβ/(cosβ-4)
已知sin(2α+β)=3sinβ,α≠kπ+π/2,α+β≠kπ+π/2,求证:tan(α+β)=2tanα
3sinβ=sin(2α+β),α≠2kπ+π/2 ,α+β≠kπ+π/2 (k∈z)求证tan(α+β)=2tanα
已知α,β≠kπ+π/2 K∈Z ,3sin(α+β)-2=0,5sin(α-β)-1=0,求tanα/tanβ的值
已知:tan(α+β)=2tanα.求证:3sinβ=sin(2α+β).
已知tan(α+β)=2tanβ,求证:3sinα=sin(α+2β)
已知sin(2α+β)+2sinβ=0.求证tanα=3tan(α+β
已知2sinβ=sin(2α+β)求证tan(α+β)=3tanα
已知sinβ=2sin(2α+β),求证 tan(α+β)=-3tanα
已知(2sin^2α+sin2α)/(1+tanα)=k,(π/4
已知2sin^α+sin2α/1+tanα=k(π/4
已知sinα=2sinβ,tanα=3tanβ,求cosα