$3x^2\cdot4x^3$
$20x^2+30x^4-40x^6-50x^5$
$h=\text{tg}\theta\cdot\text{ctg}^2\theta\cdot\text{sen}\theta$
$\lim_{t\to0}\left(\frac{8t}{\sqrt{2t+81}-9}\right)$
$-11x^{5}\left(-9x^{3}y^{4}\right)$
$3x^2\left(x-3\right)$
$\left(-4\right)^2-5\cdot\left(-4\right)-4$
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