$\left(7x^4+5\right)\left(7x^2+9\right)$
$15x-2=11x+34$
$2st^4-8st^2-90s$
$\left(4m^2-3\right)\left(4m^2-6\right)$
$\int\frac{5x^3+3}{x^2\left(x^2+2\right)}dx$
$-5+\left(-30\right)-7+3-\left(-50\right)$
$\lim_{x\to-2}\left(\frac{x^3-8}{x^4-16}\right)$
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