$\frac{25-36n^4}{5-6n^2}$
$5+5x^3$
$x+5>2x-15$
$\lim_{n\to\infty}\left(\frac{1}{9^n}-\frac{1}{7^n}\right)$
$\int\left(x+1\right)\arctan\left(3x\right)dx$
$28^3$
$3.882-3.738$
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