$\frac{4}{x^2-25}\:\:\:\:\frac{x+\:2}{x^2-2x-15}$
$\left(3m^3+2n^2\right)\left(3m^3-3n^2\right)$
$\int\left(cosx+5x^4\right)dx$
$80.000+5.000x$
$\left(4a+b\right)\left(3a-b\right)$
$\frac{3\sqrt{24a^3}}{\sqrt{3a}}$
$5x^2-12x+3=0$
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