$\lim_{x\to\infty}\left(\sqrt{x^2+5x}-\sqrt{x^2+x}\right)$
$\left(\frac{5}{6}x^5+\frac{6}{3}x^7\right)$
$\int\left(1+\sec\left(x\right)\right)^2dx$
$7a^2+5a-3=0$
$e^{2-2x+1}$
$3x^2-3x-2$
$121x^{2\:}-625$
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