$x^4+10x^2+9$
$-8+\frac{12}{n}-\frac{6}{n^2}+\frac{1}{n^3}+10-\frac{5}{n}$
$\int\left(\cos\left(2x-1\right)\right)dx$
$\frac{dx}{dt}=-2-t$
$\int\frac{3x-1}{4x^3-x^2}dx$
$x^7lx$
$\left(4x^5+2x^{10}\right)^3$
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