$\int_{2x}^{x^2+1}\frac{t+1}{t-1}\:dt$
$\frac{\left(-2x^2-5x+6\right)}{-x^2-2x-1}$
$\lim_{x\to\infty}\:\frac{5x^4+1}{x^4}$
$\int\left(9\left(15x+6\right)^7\right)dx$
$\left(a^x+bx^{x+1}\right)^2$
$x+\left(\frac{2}{x^2}\right)^3$
$\frac{8^9}{8^3}$
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