求证:(1)sin(360-α)=-sinα;(2)cos(360-α)=cosα;(3)tan(360-α)=-tan
求证:(1)sin(360-α)=-sinα;(2)cos(360-α)=cosα;(3)tan(360-α)=-tan
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^2αtanα+cos^2α/tanα+2sinαcosα=tanα+1/tanα
求证:(1+sinα)/cosα=(1+tanα/2)/(1-tanα/2)
求证(1+sinα)/(1+sinα+cosα)=1/2(1+(tanα/2))
求证(1+sinα/1-sinα)=(1/cosα+tanα)^2
1-sinαcos/cos平方α-sin平方=1-tanα/1+tanα
.[1/cos(-α)+cos(180°+ α )]/[1/sin(540°-α)+sin(360°-α)]=tan^3
证明恒等式tanαsinα/tanα-sinα=1+cosα/sinα
求证!快 sin^2α/(1+cotα)+cos^2α/(1+tanα)=1-sinαcosα