已知α是第三象限角,且f(α)=[sin(π-α)cos(2π-α)]/sin(3π-α)
已知α是第三象限角,且f(α)=[sin(π+α)cos(2π-α)tan(-α+3π/2)tan(-α-π)]/sin
已知α是第三象限角,且f(α)=[sin(π-α)cos(2π-α)]/sin(3π-α)
已知α是第三象限角,且sin+cosα/sinα-cosα=2
已知α是第三象限角,且f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-α -π) (1)
已知α为第三象限角,且f(α)=sin(π-α)cos(2π-α)tan(-α+π)/sin(π+α)tan(2π-α)
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
已知sin(π-α)cos(-α+3π/2)/cos(-π-α),且α为第三象限角1.化简f(α)2.若cos(α+π/
已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α+π)/sin(π+α)求①化简f(α)
已知sinαcosα=1/8,且α是第三象限角,求(1-cos^2 α)/(sinα-cosα)-(sinα+cosα)
已知α为第三象限角且f(α)=sin(π-α)cos(2π-α)/cos(π/2+α)
已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第三象限角,求sin(β+5π/4)的值
已知α是第三象限角,f(α)=[sin(π-a)cos(2π-a)tan(1.5π-a)tan(-a-π)]/sin(-