发布网友 发布时间:2024-10-06 03:59
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热心网友 时间:2024-10-11 05:23
f(x)=2sinxcosx+2cos^2x=sin2x+cos2x+1=根号2sin(2x+π/4)+1T=2π/2=π f(x)min=-根号2+1根号2sin(2a+π/4)+1=2sin(2a+π/4)=根号2/22a+π/4=kπ+π/4 α为锐角 a=π/4