$\left(\:x^{2n}+2\right)\left(x^{2n}-2\right)$
$-2n+m-2m+n$
$\int t^8\left(3+t^9\right)^3dt$
$\frac{5x^2+40x+37}{x+7}$
$-\left(-3^3\right)$
$\frac{\sec^2\left(a\right)-1}{\tan\left(n\right)}$
$x^3-5x^2+6$
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