$\lim_{x\to\infty}\left(x^2\left(e^{\frac{4}{x^2}}-1\right)\right)$

$m^4+6m^2+25$

$\lim_{x\to\infty}\left(\frac{2x^6-2x^2+x}{3x^3+2x^6-2}\right)$

$\left(2x\right)\left(\frac{3}{2x}\right)$

$1407+1752$

$\frac{4x^2+6x}{6x^2+9y}$

$\left(8a^3b^4c^5-24a^2b^3c^4+48ab^4c^3\right)$