隐函数求导技巧

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对于不便用自变量x表达函数及其导数,而方便用y表达的情况较为有用。 \(\frac{\mathrm{d}^2 y}{\mathrm{d}x^2}=\frac{\mathrm{d}y}{\mathrm{d}x}\frac{\mathrm{d}}{\mathrm{d}y}\left(\frac{\mathrm{d}y}{\mathrm{d}x}\right)\)

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