f(x)=4sinxsin²(π/4+x/2)+cos2x-1 =4sinxsin²[(π/2+x)/2]+cos2x-1 =4sinx[1-cos(π/2+x]/2+cos2x-1 =2sinx+2sin²x+1-2sin²x-1 =2sinx∴f(ωx)=2sinωxx∈[-π/2,2π/3]是增函数f'(ωx)=2ωcos...
已知函数f(x)=4sinxsin²(π/4+x/2)+cos2x-1
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