求值cos^2α+cos^2(α+120)+cos^2(α+240) 2 ;y=(sinα+1)(cosα+1)求最大最小值2;是第二题的意思
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求值cos^2a+cos^2(a+120°)+cos^2(a+240°)
求值cos^2α+cos^2(α+120)+cos^2(α+240) 2 ;y=(sinα+1)(cosα+1)求最大最小值2;是第二题的意思
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