[微分] tangent line

[JULIKEBEN (JU)]

the length of the portion , cut off by x-axis  and y-axis , of  any tangent line to the curve

x^(2/3)+y^(2/3)=4 is

a.2     b.4     c.8     d.none of above



請問要怎麼下手呢??

謝謝

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