$\cot\left(12.4\right)$
$\int\frac{x^3}{\sqrt{\left(x^2+81\right)}}dx$
$\int\frac{3x^3-2x^5+2}{x-2}dx$
$10-\left(-400\right)$
$\left(8a+3\right)^2$
$\left(\sqrt{10c}\right)^2$
$3\left(x-4\right)-5x$
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