$\int\frac{x^4-3}{x^2+2x+1}dx$
$\lim_{x\to\infty}\left(x^2+1\right)^2$
$650.7+380.2+205.01$
$\left(4\right)\left(3^2\right)$
$\left(\frac{5}{7}a^2+n\right)^2$
$\int\:4\:in\:9x\:dx$
$\frac{dy}{dx}=2xy-3x^2y$
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