$2r^2+r-4=0$
$3z^4-6z^2+3$
$\int\left(\sec\left(x\right)-\tan\left(x\right)\right)^2dx$
$\lim_{x\to\infty}\frac{1}{\sqrt{x-1}}$
$\frac{secx}{6tanx}$
$3.57x+1.61=4.71-2.63x$
$\lim_{x\to\infty}\left(\frac{ln\left(x^2+1\right)}{x^3-2}\right)$
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