$\lim_{x\to-\infty}\left(\frac{2x^2-2x+3}{x^2+6x-2}\right)$
$-4x^4y^3-2x^3y^4+x^4y^3-7x^3y^4$
$\left(2xy^4-5z^4\right)^4$
$x^4+18x^2+81$
$\frac{x^3+4x^2-11x-30}{x-3}$
$\frac{x^3+4x^2+x+6}{x+1}$
$\left(1.02\right)^6+\left(1.02\right)^4$
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