$\int\:\frac{2}{x^2-18x+81}\:dx$
$9\left(x^2-10x+25\right)$
$x^2=\left(x-8\right)^2$
$\int\sqrt{9\:+16x^2}dx$
$x+2y+3y$
$\frac{d}{dx}ax^3-3b^2xy+cy^3=1$
$\sqrt[5]{a^6\cdot b^8\cdot c^2}\cdot\sqrt[3]{a^9\cdot b^4\cdot c^3}$
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