$\lim_{x\to\infty}\left(\frac{5x+x^4}{x^4}\right)$
$\left(i+j\right)^5$
$\left(3x^2\right)\left(3x^6-2x^4+x^3-2x+3\right)$
$3a^2+11a+6$
$\frac{x^{2\:}5x+6}{x+5}$
$12y^2+6xy-4x^2$
$\int\frac{7}{x^2-6x-25}dx$
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