$5x^2+40x+15$
$u = \sqrt { x ^ { 2 } + y ^ { 2 } + z ^ { 2 } }$
$p^2xp^2$
$\lim_{x\to-\infty}\sqrt{x^2+4}-\sqrt{x^2+x+1}$
$\frac{x+1}{6}+\frac{x-4}{3}=\frac{1}{3}$
$9x^{16}-9y^{16}$
$6n^2-20n^2+8n^2+n^2$
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