$\frac{d^2}{dx^2}\left(x^2-4y^2=4\right)$
$-x^2+3x-4$
$\left(x^3y^{-1}\right)\left(x^{-1}y^3\right)$
$\left(x+1\right)\left(x^2-4\right)\left(x+2\right)$
$\log_{3.5}\left(7\right)=2$
$\lim_{x\to\infty}\left(\frac{\left(x^4\right)}{\ln\left(x\right)}\right)$
$\lim_{x\to2}\left(\sqrt{x^2+1}-x\right)$
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