$15x+15xy$
$\lim_{x\to\infty}\frac{4x^3-12x}{25-2x^3}$
$2x\:+\:x\:+\:4\:+\:3$
$\left(15x^2-4y\right)\left(15x^2+4y\right)$
$\sqrt{48}x^2-\sqrt{27}x^2-\sqrt{12}x^2$
$\sqrt[4]{81a^{12}h^5c^4}$
$\left(6-n\right)^2$
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