解答

For your reference

Sandra

是為了求最大值嗎

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You are right

Sandra

那tan怎麼求出來的啊

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tan(2/3 pi) check by my picture

Sandra

那我的照片第一行算式 是想表達什麼嗎

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First differential can get a slope of 0, with a max. or min. value

Sandra

如何得知 最大 最小

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Need more condition to judge

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Maybe into delta x to confirm

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