Question
यदि $f(x) = \frac{1}{{x + 1}} - \log \,(1 + x),\,x > 0,$ तब $f$ है
$f'(x) = - \left[ {\frac{1}{{x + 1}} + \frac{1}{{{{(x + 1)}^2}}}} \right]$
$f'(x) = $ ऋणात्मक, जब $x > 0$ या $f'(x) < 0$, $\forall x > 0$
$\therefore$ $f(x)$, एक हृासमान फलन है।
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