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 P: 625 Hello, considering the definition of derivative, what would the following quantity be equal to? $$\lim_{\delta \to 0} \frac{f(x+g(\delta))-f(x)}{g(\delta)}$$ In this case $g(\delta)$ is a monotonic increasing function such that g(0)=0. For example we might have $g(\delta)=\delta^3$