$\left(2^2\cdot5m^2\right)\cdot n^2+9mn-20$
$4-6x-9x^2$
$\int\frac{6x^3}{\left(\sqrt{x^2+9}\right)}dx$
$\int e^{-5x}\cos7xdx$
$-2x+5\ge15$
$\left(x^2+2\right)\left(x^2+10\right)$
$\lim_{x\to0}\left(\frac{sin\left(9x\right)}{\left(x+8\right)^3}\right)$
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