$\lim_{x\to-3}\left(\frac{x^2-3x+2}{x+3}\right)$
$4 ^ { y + 1 } \cdot 4 ^ { 1 - x }$
$\left(x+2\right)\left(x-1\right)\le0$
$\int\frac{2x^3+x^2-7x+7}{x^2+x-2}dx$
$12a^2+6a^5+8a^7$
$\int-7x\cdot\cos\left(x\right)dx$
$2+6\:x\:5$
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