$\frac{2x^2+3}{x^2+1}$
$20e^2-32ef+16f^2$
$-4x+2\le-22$
$\int\frac{u^2}{\sqrt{1-u^2}}dx$
$-\sqrt{3}\sqrt{2}$
$\int_0^2\left(x+7\right)dx$
$\lim_{x\to0}\left(tan\:x\right)^{cosx}$
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