$\lim_{x\to\infty}\left(\frac{x^2-x-1}{x^2+5x^7+3x^5}\right)$
$\int_0^{2x}\left(cos^3x\right)dx$
$7h+9-9-h$
$\int\frac{3x^4+4}{x^4+4x^2+4}dx$
$\left(2a-9\right)\left(2a+11\right)$
$\left(a+1\right)\left(a-1\right)\left(a-3\right)\left(a+3\right)$
$\left(x^2+9y^5\right)^2$
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