$\int z^2\cos\left(2x^3\right)dz$
$\left(7k+3\right)\left(7k-3\right)$
$\left(x^9-6\right)\left(x^9-4\right)$
$x^2+x<x+2$
$100a^2-64b^2$
$\frac{6x^4+23x^2+4x+15}{x^2+3}$
$1^1+2^2+3^3$
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