$ln\left|cos\left(x\right)\right|+ln\left|tan\left(x\right)\right|$
$\left(2x+1\right)^2\left(2x-1\right)^2-2$
$\frac{\left(3x^4-9x^2-12\right)}{\left(x-2\right)}$
$\:f\left(x\right)=\frac{x}{2x-4}$
$5w+3w$
$2d^2-8d$
$3\left(-2\right)^2-5+2$
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