$\left(+2\right)\cdot\left(+4\right)\cdot\left(-8\right)\cdot\left(+7\right)$
$16x^4-4$
$-3x^2+36x=-87$
$\left(3x-\frac{1}{10}\right)\left(3x+\frac{1}{10}\right)$
$\left(6.2\cdot10^{17}\right)+\left(1.2\cdot10^{15}\right)$
$\lim_{x\to0}-\left(2\left(\frac{1}{x}-cotx\right)\right)$
$\int\left(\frac{2x^3-6}{x^2}\right)dx$
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