$\frac{x^{3}-25x}{2x^{3}+8x^{2}-10x}$
$\int\frac{e^{2x}}{e^{2x}+2e^x+2}dx$
$1x^2+18x$
$\left(2x+5\right)^2-2\left(7x-4\right)^2$
$16m^2-40m^4+20m^6$
$\:972,4-39,67$
$-4xe3ye2z$
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