$\int_{.2\pi}^{.8\pi}\left(\sin\left(x\right)\right)dx$
$\frac{x^2-7x+5}{x-5}$
$\left(3b-2c\right)\left(2c-3b\right)$
$\frac{92}{11}-4.84$
$a^2-ab\:entre\:\:-3x^2$
$25x^2-1=0$
$-23x^2+68x+3=0$
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