$\frac{4\left(-1\right)^n}{n-1}x^n$
$15x^2+13x+2$
$\lim_{x\to0}\left(\frac{25}{x^2}\right)$
$\lim_{x\to\infty}\left(\frac{4x^2+9x}{7x^3+8x+5}\right)$
$30x^2+11x+1$
$\infty+3^{\infty}$
$81x^8+\:27x^6y^6+9x^4y^{12}+\:3x^2$
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