$x^2-12-45$
$x^2+2xy+y^2;\:x=2;\:y=3$
$12x^2-5x-2$
$25a^2+\frac{50}{7}ab+\frac{25}{49}b^2$
$\int\left(\frac{x^2+1}{\sqrt{x}}\right)dx$
$\lim_{x\to\infty}\left(\frac{5e^{-x}-5}{e^{2x}-1}\right)$
$\frac{x^2+4}{x^2-6x}$
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