化简(1+tan^2α)cos^2α
化简(sinα)^2tanα+cosα+(cosα)^2*1/tanα+2sinαcosα
化简:[cos(α/2)+sin(α/2)][cos(α/2)-sin(α/2)][1+tanαtan(α/2)]
化简sin^2α*tanα+cos^2α*1/tanα+2sinα*cosα
化简:(tanα/1-tanα)/(4cos^2)α=?
已知cos(2α+β)=3cosβ,化简tanα×tan(α+β)
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
求证cos(720°+α)(2/cosα+tanα)(1/cosα-2tanα)=2cosα-3tanα
化简:(sin²αtanα+cos²α/tanα+2sinαcosα)sinαcosα
求证 sin^2αtanα+cos^2α/tanα+2sinαcosα=tanα+1/tanα
化简cos^2(-α)-[tan(360°+α)/sin(-α)]
求证:tan(α/2)=(sin α)/(1+cos α)
(cosα)^2=1/(1+(tanα)^2)