$\lim_{x\to0}\left(\frac{7x}{x-tg2x}\right)$
$\int b ^ { 4 x } d x$
$\left(x^3-8\right)-\left(3x^2+7\right)$
$\int\frac{1}{2}\:t\:\sin\left(4t^2\right)dt$
$\left(7+7n\right)\left(7-7n\right)$
$5t^3-15t^2-45t-31990$
$d^2-3d$
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