$\left(2k+3\right)^2$
$\frac{14x^3y^5}{7x^8y^9}$
$\int_0^1t\:e^{-t}dx$
$121x^2-144w^2$
$-5\cdot5\cdot7$
$\lim_{x\to\infty}\left(1+\frac{\cos\left(x\right)}{x}\right)$
$6a^2+8a+2$
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