I started calculus in September (as part of A-Level Maths/Further Maths), and we've been told time after time not to look at derivatives as fractions.(adsbygoogle = window.adsbygoogle || []).push({});

We recently did the Chain Rule, and we were told that a way to remember it was that if dy/dx = dy/du * du/dx, then the 'du's 'cancel out' - which flies in the face of not looking at derivatives as fractions. My teacher then told us that we would eventually see how derivatives could be treated like fractions...

How and why can we do this?

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# Dy/dx as a fraction?

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