$x^2-15x+255$
$2g^2+16g+32$
$1x^2-4$
$x^2-6+9$
$\int\frac{2x}{\sqrt{4+x^2}}dx$
$\lim_{x\to0}\left(\frac{1}{x}-\frac{1}{sin^2x}\right)$
$\lim_{x\to-\infty}\frac{5x^3-3x}{\sqrt{4x^6-7}}$
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