$x^2+2xy+y^2;\:x=2;\:y=3$
$2^2-7x+3$
$3\sqrt{2}-3\:.\sqrt{2}-1$
$2\frac{3}{5}-1\frac{3}{5}+\frac{2}{5}$
$40\:-\:\left(-11\right)$
$\int_0^3\left(\sqrt[2]{9-x^2}\right)dx$
$\int\frac{5}{x^2+x-6}dx$
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