$a^2+2a-3a+3$
$\int\:\frac{x^3+x^2+2x+1}{x^4+3x^2+2}dx$
$3x-11<3$
$\frac{dy}{dx}+\frac{3y}{x}=7x+3$
$0.16-\left(-5.307\right)-6.8$
$\frac{b^4-81}{b+3}$
$\frac{d}{dx}\left(y=\left(9x^2-2\right)^{sec\left(x\right)}\right)$
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