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Just a simple question to see if I'm going insane. So say I have an expression for:

[tex]\frac{dxy}{dt} [/tex] and an expression for [tex]\frac{dy}{dt} [/tex], how to I go about isolating an expression for just [tex]\frac{dx}{dt} [/tex]

I have tried using the product rule but it doesn't work for what I want. I know this is a very simple question but I haven't done calculus in a long time!

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# Simple differentiation question

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