$\int\frac{2x-1}{\left(x-2\right)^2\left(x^2+9\right)}dx$
$2x-3>9$
$81b^2-90bc+25c^2$
$\left(-5\right)+\left(+8\right)-\left(-3\right)-\left(-2\right)$
$-9x^2-8y+5y-2x-9$
$\lim_{x\to0}\left(ln\left(x^{sin\left(1-2^x\right)}\right)\right)$
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