$\left(o.4a-5b\right)\left(0.4a+5b\right)$
$\int xsin\left(\frac{1}{x}\right)dx$
$cos\left(1\right)cos\left(2\right)+sin\left(3\right)sin\left(4\right)$
$\frac{n\:dn}{n}=te^{t+2}dt$
$\lim_{x\to6}\:\left(y-5\right)\left(y-7\right)$
$\lim49\left(\frac{1}{\sqrt{x}-7}-\frac{14}{x-49}\right)$
$x^3-4x^2-3x+18$
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