$\lim_{x\to\infty}\left(\cos\left(\frac{x^7}{x^8}\right)\right)$
$\int\left(x^4+1\right)^7dx$
$2x^2-13x-21=0$
$6-4\cdot5$
$x^2+y^2=5$
$x^2-12x+36=81$
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