sin(π/3-x)+cos(x+π/6）可化简为

cos(x+π/3)是不是等于sin(x-π/6) cos(π/6-x)=sin(π/3+x)?为什么 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 为什么cos(2x-π/3)-sin(5π/6) =cos(2x-π/3)? 求证 tan（2π-X）sin（-2π-X）cos（6π-X）/ sin（X+3π/2)*cos（X+3π/2)=-tanX 已知函数f（x）=［2sin（x-π/6）+√3sin x］cos x+sin^2x,x∈R 已知F(X)=根号3COS^2 X+SIN XCOS X-2SIN X*SIN(X-π/6),求F(X)的最大值 tanx=m,则{sin(x+3π）+cos(π+x)}/{sin(-x)-cos(π+x）}=? ,函数f(x)=sin(x+π/6)+cos(x+π/3)的值域为., cos(π/6-x)=根号3/3则cos(5π/6+x)-sin(x-π/6)的平方 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π) 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π) sin(x+π/3)+（tanπ/6）cos(x+π/3) 化简 sin(x+π/3)+（tanπ/6）cos(x+π/3) 化简 sin(π/3-3x)cos(π/3+3x)-cos(π/6-3x)sin(π/6+3x) 化简 化简求值:sin(π/4-3x)*cos(π/3-3x)-cos(π/6+3x)*sin(π/4+3x) 函数Y=sin(2x+π/3)cos(x-π/6)-cos(2x+π/3)sin(x-π/6)的图像的一条对称轴方程是多少 已知sin(x+π/3)=1/4,求sin(2π/3-x)+cos²(π/6-x) 求值sin²x+cos²(π/6+x)+1/2sin(2x+π/6)