$f\left(x\right)=\frac{1}{x^4}+2x+3$
$\frac{18x^4y+8x^3y-4x^2y^2}{2xy}$
$3x^2y^2dx+2x^3ydy$
$m^2+6mn+9n^2$
$3\cdot8+4\cdot7$
$\lim_{x\to0}\frac{5x^3-4}{x^2-3x+2}$
$\lim_{x\to-4}\left(\frac{7x\:+\:28}{x^2-x-12}\right)$
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