$2x^{a+4}-8y^{a-1}^3$
$-\left(3a\:-\:3\right)$
$\lim_{x\to-2}\left(\frac{\left(2+x\right)^2-4}{x}\right)$
$x^2-24x+78$
$\int\left(\frac{x^2-2x+4}{\left(x+1\right)\left(x-1\right)}\right)dx$
$\int_0^{\infty}\:\:\left(-\:\frac{sen\:x}{x}\right)\:dx$
$3x^2+12x-13>0$
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