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[函数] 三角函数值域

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hjfmhh posted 2020-3-17 15:36 |Read mode
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力工 posted 2020-3-17 22:41
回复 1# hjfmhh
原来就是两点距离和的展开吧?$\sqrt{(\cos x+\frac{1}{2})^2+\sin^2 x}+\sqrt{(\cos x-\frac{1}{4})^2+(\sin x-\frac{\sqrt{3}}{4})^2}$
初等方法不好求,主要是渣渣不会求。

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isee posted 2020-3-17 23:25
回复 2# 力工

这么一换,感觉还有椭圆有点牵扯。。。

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