$\sin\left(2\pi-x\right)$
$\lim_{x\to\infty}\frac{4x+8}{7x^2+6x-5}$
$\lim\:_{x\to\:-2}\left(\frac{x^8+3x^2+2x}{x^2-x-6}\right)$
$3x^2-9<0$
$+\left(-1\right)-\left(-2\right)$
$ctg^2x\left(1-cos2x\right)+sen^2x=2$
$\left(a-3\right)\left(a+1\right)$
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