若sin(α-π/6)=1/3 则cos(2α-π/3)的值等于
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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1+cosα/sinα=2 则cosα-3sinαRT...
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cos(α-β)=1/3,则(sinα+sinβ)^2+(cosα+cosβ)^2=?
若cos( α-β)=1/3则 (sinα+sinβ )^2+(cosα+cosβ )^2rt
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,
已知3sinα=cosα,则sinα-2sinαcosα+3cosα+1=
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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
若sin(π/6-α)=1/3,则cos(2π/3+α)=
若sin(π/6-α)=1/3 则cos(2π/3+α)=?
若sin(π/6-α)=1/3,则cos(2π/3十2α)
若α是锐角,且sin(α-π/6)=1/3,则COSα=
若方程12x²+πx-12x=0的两的根分别是α,β,则cosαcosβ-√3sinαcosβ-√cosαsinβ-sinαsinβ=