cosαtan(2π+α)化简
化简:[sin(π+α)*cos(π-α)*tan(π-α)]/[cos(π/2+α)*tan(3π/2-α)*tan(
化简sin³(﹣α)cos(2π+α)tan(2π-α)/sin(α-2π)cos(α-3π/2)-tan(π
[sin(2π+α)·tan(-α)·cos(-α)]÷[sin(-α)·cos(2π+α)·tan(2π+α)化简
化简:tan(π-α)·sin²(α+π/2)·cos(2π-α)/cos³(-α-π)·tan(α
化简:(1)、tan(2π+α)tan(π+α)cos(-π-α)的3次方分之sin(-α)的平方乘以cos(π+α);
已知cos(2α+β)=3cosβ,化简tanα×tan(α+β)
求证cos(720°+α)(2/cosα+tanα)(1/cosα-2tanα)=2cosα-3tanα
化简:(sin²αtanα+cos²α/tanα+2sinαcosα)sinαcosα
化简(sinα)^2tanα+cosα+(cosα)^2*1/tanα+2sinαcosα
化简{sin(π+α)^3cos(-α)cos(π+α)}/{tan(π+α)^3cos(-π-α)^2}
化简:{sin^2(α+π)*cos(α+π)*cos(-α-2π)}/{sin(-α-2π)*tan(π+α)*cos
化简sinαcosα(tanα+cotα)