sinx+sin(x+2/3π)+sin(x-2/3π)

函数f(x)＝3sinx+sin(π2+x) 求X解集：sinx=2sin(π/3-x) f(x)=2cos*sin(x+π/3)-^3sin^2x+sinx*cosx |sin(x+π/2)|-|sinx|求导过程? 函数f(x)=[2sin(x+π/3)+sinx]cosx-根3sin^2x,(x∈R). 已知函数f(x)=[2sin(x+π/3)+sinx]cosx-√3sin²x,x∈R 已知函数f（x）=2cosx*sin(x+π/3)-√3sin^2x+sinx*cosx 已知函数f(x)=2cosx*sin(x+π/3)-根号3sin^2x+sinx*cosx 设f（x）=2cosx.sin（x+π/3)-根号3 sin平方x+sinx.cosx 已知函数f(x)=sinx+sin（x+2/3π)(x∈R ) 已知sinx+cosx/sinx-cosx=2,求2cos(π-x)-3sin(π+x)/4cos(-x)+sin(2π 已知sinx+cosx/2sinx-3cosx=3 求 2sin²x-3sin（3π+x）cos（π-x）-3