求证:(1+sin 2α)/(2cos^2 α+sin 2α)=(1/2)tan α+(1/2)
求证:tan(α/2)=(sin α)/(1+cos α)
求证:tanα/2=1-cosα/sinα=sinα/1+cosα
求证1+2sinαcosα/sin^2α-cos^2α=tanα+1/tanα-1
求证:sin^2/(sin-cos) - (sin+cos)/(tan^2 -1) =sin+cos
求证(1+sinα)/(1+sinα+cosα)=1/2(1+(tanα/2))
求证(1+sinα/1-sinα)=(1/cosα+tanα)^2
求证 sin^2αtanα+cos^2α/tanα+2sinαcosα=tanα+1/tanα
求证:(1+sinα)/cosα=(1+tanα/2)/(1-tanα/2)
求证!快 sin^2α/(1+cotα)+cos^2α/(1+tanα)=1-sinαcosα
1.求证tanα/2=sinα/(1+cosα)=(1-cosα)/sinα
求证:(1-sinα+cosα)/(1+sinα+cosα)=tan(π/4-α/2)
求证:1-2sinαcosα/cos²α-sin²α=tan(π/4-α)