sinx+sin(x+2/3π)+sin(x-2/3π)

sinx>sin(2π/3-x)（0 f(x)=2sinx*sin(x+π/3) 化简 求X解集：sinx=2sin(π/3-x) |sin(x+π/2)|-|sinx|求导过程? 化简：（sinx）^2+(sin（x+π/3))^2+(sin(x+2π/3))^2 sinx+sin(x+2/3π)+sin(x-2/3π) 解方程：sinx=2sin(π/3-x) sinx+cosx/sinx-cosx=2,则sin(x-5π)sin(3π/2-x)=? S(1-sin^2x)d(sinx)为什么=sinx-1/3sin^3x? 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? (sinx-1)tanx怎么化简成[（sinx-sinπ/2）/sin（x+π/2）]sinx,x趋于π/2 化简变形f(x)=[2sin(x+π/3)+sinx]cosx-√3sin^2x sinx+sin-x= 1-2sinx*sin(60+x)sin(60-x) 若sin(π/2+x)+sin(π+x)=1/3,则sinx·cosx的值为 若sin(π/2+x)+sin(π+x)=1/3,则sinx·cosx的值为 证明成立：[cos(3x)-sin(3x)]/(cosx+sinx)=1-2sin(2x). sinx*( cos x)^3/(1+sin^2x)的不定积分