• 试题 ID 36375


若 $\left\{\begin{array}{l}x=\sqrt{2} \cos ^3 t, \\ y=\sqrt{2} \sin ^3 x,\end{array}\right.$ ,求 $\left.\frac{d^2 y}{d x^2}\right|_{t=\frac{\pi}{4}}$
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解析:

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