$\left(2\sqrt{z}+3b\right)\left(2\sqrt{z}-3b\right)$
$-a^2b^2-a^2$
$\lim_{x\to-\infty}\:\left(xsin\right)\left(\frac{\pi}{x}\right)$
$\frac{\left(x-1\right)}{\left(x^2-2x\right)}$
$\left(1\:+\:y^2\right)\:\:dy\:+\:\left(1\:+\:x^2\right)\:\:dx\:=\:0$
$-5<-189-j$
$\frac{10x^4-15x^3}{5x^2}$
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