作业帮y=2sin^2x-sinxcosx+3cos^2x求最小正周期,单调增区间,在[0,π/2]上的值域
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y=2sin^2x-sinxcosx+3cos^2x求最小正周期,单调增区间,在[0,π/2]上的值域
y=2sin^2x-sinxcosx+3cos^2x求最小正周期,单调增区间,在[0,π/2]上的值域
y=2sin^2x-sinxcosx+3cos^2x求最小正周期,单调增区间,在[0,π/2]上的值域
y=2(sinx)^2-sinxcosx+3(cosx)^2
=2-sin2x/2+(cosx)^2=2-sin2x/2+cos2x/2+1/2
=5/2+(√2/2)cos(2x+π/4)
π+2kπ
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