化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
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
②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π
若f(α)=[sin(π-α)cos(2π-α)tan(-α+π)]/[-tan(-α-π)sin(-π-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);
求证:(1-sinα+cosα)/(1+sinα+cosα)=tan(π/4-α/2)
求证:1-2sinαcosα/cos²α-sin²α=tan(π/4-α)
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值
试证明:1+2sinαcosα/cos平方α-sin平方α=tan(π/4-α)
sinα+cosα=tanα(α∈(0,π/2)),求α范围
高中三角数学化简:sin(α-π)/ tan(α+π)* tan(α-2π)/ cos(α-π)* cos(2π-α)/