化简:[cos(α/2)+sin(α/2)][cos(α/2)-sin(α/2)][1+tanαtan(α/2)]
化简:(sin²αtanα+cos²α/tanα+2sinαcosα)sinαcosα
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:sin^2α×tanα+cos^2α×cotα+2sinα×cosα
化简cos^2(-α)-[tan(360°+α)/sin(-α)]
证明:1+sinα−cosα1+sinα+cosα=tanα2
求证:tanα/2=1-cosα/sinα=sinα/1+cosα
求证:tan(α/2)=(sin α)/(1+cos α)
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
证明:1-2sinα cosα/cos^2α -sin^2α=1-tanα/1+tanα
求证1+2sinαcosα/sin^2α-cos^2α=tanα+1/tanα-1