$-20^0-\left(1\right)^{20}+\left(1\right)^{19}$
$-9w^3x^4y^2-45w^2xy-25x^2y$
$\left(y-7\right)^5$
$\sqrt{a+b-2\sqrt{ab}}$
$\frac{24a^6}{6a^4}$
$x^2-3xy^2+5x^2y-7xy^2+9x^2y$
$\lim_{x\to0}\left(\sin\left(a+x\right)-\sin\left(a\right)\right)$
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