$x^2y+9x^2y-y^2-z$
$9a^7+b^4-12a^1b^4$
$\frac{x^3-2x^2-11x+12}{x-1}$
$\int sen\left(\frac{x}{3}+\sqrt{5}\right)dx$
$2^3+3.2^23+23^2+4^3$
$10n^2+40n$
$y'=\frac{-y}{x}$
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