$\left(2x\:^3+7z\:^5\right)\left(2x\:^3-7z\:^5\right)$
$\int\frac{x^2}{sin\left(x^2\right)}dx$
$\lim\:_{x\to\:0}\left(\frac{3x}{\:\sqrt{2x-49}-7}\right)$
$\left(+3\right)\:-\:\left(\:+\:5\:-\:6\:\right)$
$4x^2+7x^2$
$18+3a$
$\frac{\left(x+10\right)^2-\left(x-10\right)^2}{8}$
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