$\lim_{h\to\infty}\left(\frac{5h^4-2h^2+3}{3h^3+2h^2+h}\right)$
$4n+6+n-2$
$x^3-19x-30$
$5\sin^2x\sec\left(x\right)\cot\left(x\right)$
$x-19=-14$
$a^{15}-b^9$
$\left(9a^{m+1}-46^{10}\right)^2$
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