$-2x^2-5xy,x=-1,y=2$
$\left(9x^2\right)^2-\left(y\right)^2$
$\left(\sqrt{p}-\sqrt{7}\right)^2$
$\frac{1}{3}cos\:\left(-3x\right)$
$\left(x-8a\right)^2$
$\int x^4e^{5x}dx$
$-14ab+8ba-ab$
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