Mathematik-Online problems: Problem 183: Derivatives

$\displaystyle \textnormal{a) }\qquad f(x)$	$\displaystyle =$	$\displaystyle 2x-\ln{x}$
$\displaystyle \textnormal{b) }\qquad f(x)$	$\displaystyle =$	$\displaystyle x\ln{\frac{x^2}{2}}$
$\displaystyle \textnormal{c) }\qquad f(x)$	$\displaystyle =$	$\displaystyle \ln{\frac{1+x}{1-x}}$

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	Mathematik-Online problems:
	Problem 183: Derivatives