Difficult# Comparing Derivatives Again

APCALC-RBYBUV

For which of the following does:

$$\lim \limits_{h \to 0} \frac{f(x+h)-f(x)}{h}$$

...yield the same result?

I.$f(x)=\tan^{-1} \sqrt{x}$

II.$f(x)=\ln(1+x)$

III.$f(x)=-\cot^{-1} (\sqrt{x})$