$\left(3x+y-3\right)\left(3x+y+3\right)$
$\int\left(\sqrt{1+\sin\left(5x\right)}\right)dx$
$3-2^2\cdot4-2-2\cdot4^2$
$x^2-13x-30$
$\frac{2x^2+x-1}{\sqrt{x^2+3}}$
$5m-4n-7m+8n-m+10n$
$2\:.\:-5\:.\:9\:.\:-7\:\:.\:-2$
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