$-8n+n$
$\lim_{x\to-\infty}\frac{4x+3}{5x^3+3}$
$\left(x+20\right)\left(x-3.1\right)$
$2^3+4\cdot2^2-3\cdot2+2$
$cos\left(a+b\right).cos\left(a_{-b}\right)=cos^2\:a\:-\sin^2b$
$4\left(-1+j\right)$
$8\tan\left(-x\right)\cos\left(x\right)$
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