$6n-4=5n$
$\int\left(2x^2e^{-x}\right)dx$
$4x^3-8x^2\:\:entre\:2x$
$sin\left(-x\right)cscx$
$y=\sqrt{x^2+7x}$
$x^2-8x+9=0$
$\frac{229.4\left(\sin\left(22\right)\right)}{\sin\left(10\right)}$
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