$\left(3x^2+7^2\right)$
$\frac{d^3}{dx^3}\left(\frac{1-x}{1+x}\right)$
$-2x-3\ge3$
$( y - 2 ) 5$
$\lim_{x\to0}\left(\frac{\sin\left(bx\right)}{\sin\left(ax\right)}\right)$
$\lim_{x\to0}x^2\left(e^{-x^{-2}}-1\right)$
$6x^2+3a^2=12$
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