$\left(2ab+1\right)\left(2ab-1\right)$
$\left(x+6\right)^2=x^2+36$
$78+\left(109-11\right)\cdot12-8$
$319+1004+12.319$
$\left(-5x-6\right)\left(5x-6\right)$
$\frac{d^2}{dx^2}\left(3^{5x}\right)$
$\int\frac{y^2}{x^3}dx$
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