What I know from the chain rule is that if y and u are differentiable with respect to x then dy/dx = (dy/du)*(du/dx)(adsbygoogle = window.adsbygoogle || []).push({});

Now, why is this example doesn't work:

y = x^2

u = c

then we have dy/dx = (dy/du) * (du/dx) = (dy/du) * 0 = 0 doesn't equal 2x

I want an answer irrelated to the chain rule, not explainations involving limits only.

THANKS

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# About the chain rule what's wrong with me?

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