$\left(\frac{4\sqrt{7}x^n}{5}-y^m\right)^2$
$1.6cos\left(\frac{\pi\:}{0.8}x\right)+2.2,\:x=1$
$f\left(x\right)=\frac{2x\:+4}{x^2}$
$\frac{x^2+36}{x-6}\lim\:_{x\to\:\infty\:}\left(3\right)$
$3x^6-81$
$\:\left(2x+y-3\right)\left(2x+y+3\right)$
$\sqrt{0.4}$
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