$\lim_{x\to\infty}\left(-\frac{x}{x}\right)$
$\frac { a ^ { 3 } + 2 ^ { 3 } } { a + 2 }$
$6x^2-13x-5=0$
$m^2+m+49$
$\int\left(\cos x-\sin x\right)d^2$
$19\:.\:7\:-\left(-4\right)$
$5x^2-12x-5$
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