$\frac{8x^3+27y^3}{2x+3y}$
$0=18x^5+30x^4+12x^2+30x^3$
$\int2x^3\cos\left(nx\right)dx$
$\frac{\left(81+x^2\right)}{\left(9+x\right)}$
$-14mn+11mn-9mn-6$
$\lim_{x\to3}\frac{3x^2-4x-15}{x^2-5x+6}$
$n^{-1}\:\frac{18}{r^2}$
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