$4x^4+12x^2y+9y^2$
$\left(x^4-2x^2+1\right)^2$
$\left(2n+1\right)^2-2\left(2n+1\right)\left(n\right)+n^2$
$-170,55\:-170,54$
$2x^2+x+8$
$\int_7^{\infty}\left(\frac{7}{x^2-1}\right)dx$
$\frac{26.2}{6.2}$
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