$26\cdot32\cdot21$
$\left(-2\right)^4\:\left(-5\right)^4$
$16a^4+9b^2+24a^2b$
$15r-21r$
$\int\left(14xe^{-x^2}\right)dx$
$\left(3p-2q\right)\left(3p+2q\right)$
$\lim_{z\to3}\left(\frac{x^3-27}{x^2+9}\right)$
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