$-x^2+1\ge0$
$\frac{12x^3+10x^2+11x+9}{3x+1}$
$\frac{dx}{dv}=\frac{x\ln\left(x\right)}{v}$
$\int\:\:3^{x+1}dx$
$\lim_{t\to3}\left(\frac{t^{2}+4t-21}{t-3}\right)$
$\frac{8a^6-64}{2a^2-4^3}$
$\lim_{x\to0}\left(\frac{6x^2}{secx-1}\right)$
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