【sin(α+2kπ)+cos(π/2+α)+tan(3π-α)】/【sin(α-π)+cos(α-π/2)+cot(π
【sin(α+2kπ)+cos(π/2+α)+tan(3π-α)】/【sin(α-π)+cos(α-π/2)+cot(π
sin^2α*tanα+cos^2α*cotα-2sinα*cosα(π-α)
化简 f(α)=sin(π—α) cos(2π—α)tan(-α+3/2π)/cot(-α-π)sin(-π-α)
化简sin^2(α+π)cos(π+α)cot(-α+2π)/tan(π-α)cos^3(-α-π)
已知tan(π/4+α)=-3,求[2(Sinα)的平方+3SinαCosα]/(Cotα-SinαCosα)的值.
已知(sinα+cosα)/(sinα-cosα)=3,求[sin²(2π-α)+cot(3/2*π-α)]/
化简sin(2π-α)*tan(π+α)*cot(-α-π)/cos(π-α)*tan(3π-α)(急)
化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α)
已知tan(3π+α)=2,求:1、(sinα+cosα)²;2、sinα-cosα/2sinα+cosα
已知tan(π-α)=2,求sinα-2sinαcosα-cosα/4cosα-3sinα的值
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值
求证:(1-sinα+cosα)/(1+sinα+cosα)=tan(π/4-α/2)