$-1^6$
$\lim_{x\to\infty}\left(\frac{ln\left(x^4+3\right)}{7x+4}\right)$
$\lim_{x\to8}\left(\frac{\sqrt{2x}-\sqrt{6x-32}}{x^2-8x}\right)$
$x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=\frac{b^2}{4a^2}-\frac{c}{a}$
$4\cdot r+5<9$
$x+y=\tan^{-1}$
$121m^2-144n^2$
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