化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α)

化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α) 化简sin^2(α+π)cos(π+α)cot(-α+2π)/tan(π-α)cos^3(-α-π) 化简[sin(π-α)tan(5π/2+α)]/[cos(2π-α)cot(π/2-α)] sin^2α*tanα+cos^2α*cotα-2sinα*cosα(π-α) 1)求证cotαcosα/cotα-cosα=tan(α/2+π/4) 化简 [Sin(π+α)\tan(π+α)] ×[ cot(2π-α)\cos(π+α)]×[sec(2π-α)\csc cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α) 急昂 已知tan(π/4+α)=-3,求[2(Sinα)的平方+3SinαCosα]/(Cotα-SinαCosα)的值. 化简：sin^2α×tanα+cos^2α×cotα+2sinα×cosα 化简sin^2α*tanα+cos^2α*cotα+2sinα*cosα-cotα 化简sin(2π-α）*tan(π+α）*cot(-α-π）/cos(π-α）*tan（3π-α）（急） 化简sin²(α+π)·cos(π+α)·cot(-α-2π)/tan(π+α)·cos²(-α-π