$\lim_{x\to\infty}\left(\frac{x+1}{x^3+x}\right)$
$\frac{cos\left(-x\right)+4cos\left(x\right)}{4sin\left(x\right)+9sin\left(-x\right)}$
$x^2+x+25$
$\left(-9.16\right)\left(-2.12\right)$
$\int_0^{\infty}\left(\frac{lnx}{\sqrt{x}}\right)dx$
$\sqrt{16a^8}b^{-2}$
$3mn-6mn+8n+9m$
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