sin（x-π/3）=1/3,则cos（x+π/6）=?

tanx=m,则{sin(x+3π）+cos(π+x)}/{sin(-x)-cos(π+x）}=? sin（x-π/3）=1/3,则cos（x+π/6）=? 若cos x-sin x = 0.5,则cos^3 x-sin^3 x = 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 已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值第一题1/2cos x-√3/2sin x第二题√3sin x+cos x第三题√2[sin x-cos x]第四题√2cos x-√6sin x 设f(sin x)=3-cos 2x,则f(cos x）=? 若F(sin x)=3-cos 2x 则F（cos x）=? 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 若sin x/2 - cos x/2 = 1/3,则sin x=? 若sin x/2-cos x/2=1/3,则sin x= 若cos(x+y)cos(x-y)=1/3,则cos^x-sin^y=?^为平方 若sin(π+x)+cos(π/2+x)=-m,则cos（3π/2-π）+2sin（6π-x）=? 化简sin(x+7π/4)+cos(x-3π/4）步骤我已经找到撒sin(x+7π/4)+cos(x-3π/4)=sin(x+2π-π/4)+cos(x-π+π/4)我问下这一步是在干嘛?=sin(x-π/4)+cos[-(π-x-π/4)]=sin(x-π/4)+cos(π-x-π/4)=sin(x-π/4)-cos(x+π/4)=sin(x-π/4)-cos(x+π/2- sin(5x)-sin(3x)= 根号2cos(4x)1.sin(5x)-sin(3x)= （根号2）cos(4x)解方程2.sin（x）+sin(2x)+sin(3x)=1+cos(x)+cos(2x) 若方程12x²+πx-12x=0的两的根分别是α,β,则cosαcosβ-√3sinαcosβ-√cosαsinβ-sinαsinβ= Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少? 高数三道大题求解析17.化简sin(2π-α)cos(π/2+α)cos(π/2-α)/[sin(3π-α)sin(-π-α)sin(π/2+α)]=多少?18.若cos(α+π/3)=4/5,α∈（0,π/2）,则cosα=多少?19.已知函数f(x)=1+√2cos(2x-π/4)/[sin(x+π/2)](1)求f（x）的定义