$-2x^2+4x\left(3\right)$
$\lim_{x\to0}\left(\frac{5^{cosx}-5}{2x}\right)$
$\frac{3x-2y^2}{27x^3-8y^6}$
$2\sin\left(x+3.1416\right)$
$-21\left(3\right)$
$\lim_{x\to\infty}\left(\frac{1-\cot\left(nx\right)}{1-\tan\left(nx\right)}\right)$
$8\left(\left(8+\left(-4\right)+\left(-7\right)\right)\right)$
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