$\int1-e^{-x}-xe^{-x}dx$
$32a^4b^5\sqrt[4]{ab^2}$
$9x^2-30x+225$
$12=3x$
$18-\left|2\left(8-3\right)\right|$
$\int\frac{5x^2+20x+6}{x^3+2x^2}dx$
$a^2-18a+81$
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