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[函数] 请教一道值域问题

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数学小黄 posted 2013-10-12 21:22 |Read mode

Last edited by hbghlyj 2025-5-10 22:22求函数$y= 3 \cos ^2 \theta-4 \cos \theta-\sqrt{2} \sin \theta+\frac{5}{2}$值域。$\theta$任意

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kuing posted 2013-10-12 22:48

又三次方程……

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kuing posted 2013-10-12 23:05

好像目测错了，四次方程才是…………

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