$\left(-x+5\right)\left(3x\right)$
$\lim_{x\to45}\left(cot\:x\right)$
$\left(5n^4+3\right)\left(5n^4-3\right)$
$\frac{-\infty^2}{2}$
$\frac{cos\left(-x\right)}{sin\left(-x\right)}$
$-3\-3xy\left[-2xy^2\left(1-b\right)+3x-y\\right]$
$\left(-3ab\right)\left(2a^{2}-7ab+8b^{2}\right)$
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