$\int\frac{x-13}{\left(x^2+8x-9\right)}dx$
$98\cdot32+44+76\cdot430$
$ycscx\cdot sinx$
$\left(6x^2-5x-2\right)^2$
$a3-5a+1\:entre\:a+2$
$x^2+7x-7\left(x^2+x\right)$
$\sin\left(x\right)-2\sin\left(x\right)$
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