若cos(π/6-α)=m,则sin(2/3π-α)的值为

若cos(π/6-α)=m,则sin(2/3π-α)的值为 若sin(α+β)sin(β-α)=m,则(cosα)^2-(cosβ)^2等于? 若sin(α+β)sin(β-α)=m,则cos^2α-cos^2β等于? 若sin(π+x)+cos(π/2+x)=-m,则cos（3π/2-π）+2sin（6π-x）=? 若sinα+sin^2α=1,则cos^2α+cos^6α+cos^8α=? 若sinα+sin^2α=1,则cos^2α+cos^4α+cos^6α=? 若m=(2-sinα)/(2+cosα) 则m的取值范围是 设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π＋α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2（-sinα)(-cosα）+cosα/[1+sin² 若sinαsinβ+cosαcosβ=0,则sinαcosα+sinβcosβ= .1若sinαsinβ+cosαcosβ=0,则sinαcosα+sinβcosβ= 2已知sin(α+β)=1,则cos(α+2β)+sin(2α+β)=急, 若sinα=(m-3)/m+5,cos=(4-2m）/m+5,π/2＜α＜π,则m= sinα+cosα=m sinα-cosα=?sinα+cosα=m 则sinα-cosα=? 已知sinα=m-3/m+5,cosα=4-2m/m+5,若α∈(π/2,π),则tanα/2的值 tanα=m,则sin(α+3π)+cos(π+α)/sin(－α)-cos(π+α)等于? 若（sinα+cosα）/（sinα-cosα）=2 则sin(α-5π)·sin(3π/2-α)=? 若sinα+cosα/sinα-cosα=2,则sin(α-5π）*sin（3π/2-α）等于? 3sinα=2cosα,则 cosα-sinα/cosα+sinα/ cos3sinα=2cosα,则cosα-sinα/cosα+sinα/cosα+sinα/cosα-sinα 已知sin(α+β)sin(β-α)=m,则(cosα)^2-(cosβ)^2=___ 已知sin(α+β)sin(β-α)=m,则cos^2α-cos^2β的值是多少?