$\left(\frac{2}{3}x\:+4\right)^2$
$6-x-x^2$
$\pi\int_0^0\left(9-x^2\right)dx$
$-24.37+8$
$a^2+a^2+a^2-13a^2$
$\int\frac{-7x+3}{8x^2+6x+1}dx$
$\frac{5x^4-2x^2+3}{x+5}$
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