Practicing Success
Practicing Success
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If the function $f(x)= a log x + \frac{b}{x}+x$ has extreme values at $ x= 1 $ and $x= 3 $, then (a, b) is : |
$\left(-\frac{1}{2},-\frac{3}{2}\right)$ $(4, 3)$ $(-2, -1)$ $(-4, -3)$ |
$(-4, -3)$ |
