f(x)=2sinxcosx-2cos^2x=sin(2x) -cos(2x)-1=√2 sin(2x -π/4) -1最小正周期Tmin=2π/2=πx∈[0,π/2],则 2x-π/4∈[-π/4,3π/4]sin(2x-π/4)∈[-√2/2,1]√2 (-√2/2) -1≤f(x)≤√2 -1-2≤f(x)≤√2 -1函数的取...