$15a^2-6ab-8a^2+20-5ab-31+a^2-ab$
$2x-5x+9x$
$x^2+3x+\frac{9}{4}$
$9a-3a+5a$
$-x-x$
$-3x-9+15x$
$a+2a+9a$
The logarithmic derivative of a function f(x) is defined by the formula f'(x)/f(x).
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