$\lim_{x\to6}\left(\frac{\sin\left(2x-8\right)}{x-6}\right)$
$\left(xy^2+x\right)^2$
$\left(-3\right)^2-4\left(1\right)\left(-3\right)$
$\int_1^4\left(\pi x\right)dx$
$\int x\left(-\frac{x+6}{x^7}e^{-x}\right)dx$
$a^2+4b^2+4ab-x^2-2ax-a^2$
$3x=9x$
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