$-1+x+x^2\left(x-1\right)$
$\frac{10a^7b^9}{15a^5b}$
$\int\frac{1}{cos^3x}dx$
$5=x^2-4$
$\left(x^3y+9xy^2z\right)^2$
$\left(25xy-5xy^2\right)^2$
$8+4+6+9+19+12+15-19$
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