设cosα=t,则tan(π-α)=?
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)
设tanα/tanα-1=-1,则sin2α+sinαcosα+cos2α分之7等于
设tan(5π+α)=m,求[sin(-α)-cos(π+α)]的值
设cosα=负五分之根号五 tanβ=三分之一 π< α
设α为锐角,tanα=3 求(cosα-sinα)/cosα+sinα)
设tanα=2,计算sinα+cosα/sinα-cosα
设α∈(0,π/4),sinα+cosα=7/5,则tanα=___
设α使第三象限角,tan(π-α)=-5/12,则cos(3π/2-α)=
设α是第三象限角,tanα=5/12,则cos(π-α)等于多少?
设cosθ=t(t≥0),求sinθ和tanθ的值
求证cos(720°+α)(2/cosα+tanα)(1/cosα-2tanα)=2cosα-3tanα
x=cos(π+α)sin²(3π+α)/tanαtan(π+α)cos三次方(-π-α),则x²+