sin(π/3-3x)cos(π/3+3x)-cos(π/6-3x)sin(π/6+3x) 化简

sin cos之间怎么转换?sin(π/3-2X）等于cos多少? cos(x+π/3)是不是等于sin(x-π/6) cos(π/6-x)=sin(π/3+x)?为什么 tanx=m,则{sin(x+3π）+cos(π+x)}/{sin(-x)-cos(π+x）}=? 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 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) 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 cos (2x-π/3)=2sinπ/4 2cos(2x+π/3)怎么变成sin 为什么cos(2x-π/3)-sin(5π/6) =cos(2x-π/3)? 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(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[cos^2(x^3+x)],求导 根号3sin x+cos x要化简 若方程12x²+πx-12x=0的两的根分别是α,β,则cosαcosβ-√3sinαcosβ-√cosαsinβ-sinαsinβ= 2sin^2x - 5sin x cos x=3 cos^2x,求X,