sin和cos的单调递增区间怎么求期间和单调递减区间是?

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在负一道正无穷单调递减
y=sin^2x+根号3sinxcosx+2cos^2x
=sin^2x+根号3sinxcosx+cos^2x+cos^2x
=1+(2分之根号)3si...
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