- #1

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You should upgrade or use an alternative browser.

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- Thread starter funlord
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- #2

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If we write ##y'## for ##\frac{dy}{dx}## then that is

$$\frac1{y'}\frac d{dx}\left(\frac 1{y'}\right)$$

What happens when you perform the differentiation?

- #3

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Thank you very much, I can understand now why it has a negative sign

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