$\int\frac{1}{x^2+a}dx$
$\int\left(x-1\right)\left(x+1\right)\left(x^2+1\right)dx$
$bc+ba+ca-ba-bc-ac$
$2^2-1$
$7a^4b^5c^7\cdot2a^{-2}b^{-3}c^2$
$12a^2b\:y\:18a^3b^2$
$x^2\int\sqrt{x^2-1}dx$
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