$1+18x+81x^2$
$\cot\left(x\right)\tan\left(\frac{x}{2}\right)=\frac{cosx}{1+cosx}$
$-6x\cdot5x^2$
$\lim_{x\to\infty}\left(3x^6sin\left(\frac{1}{6x^6}\right)\right)$
$\left(5bd^3-1\right)\left(5bd^3+1\right)\:$
$sec^2x-4$
$4-6m^x$
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