$\int_4^{\infty}\left(\frac{1}{4+x^2}\right)dx$
$\frac{-6a^{-5}b^{8}}{-2a^{-6}b^{10}}$
$\left(-x-6\right)^2\left(x^2-12x+36\right)^2$
$\lim_{x\to\infty}\left(\frac{2x-1}{x\left(x-1\right)}\right)$
$4x^2-8x+4=y^2+3x+2$
$25x^{4}-10x^{2}+1$
$x\frac{dy}{dx}+3x=x^2-1$
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