$\lim_{x\to\infty}\left(\frac{senx\:-\:x}{x^3}\right)$
$2x-1<3$
$5x^2-26x+5$
$\sqrt{4\cdot25}$
$\left(-4\right)\left(-3\right)\left(+5\right)\left(-7\right)$
$wx+nx+yw+yn$
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