$\frac{sen^2x}{\left(1-cosx\right)^2}1$
$\frac{5}{1-x}=y+2$
$1x^2+\:4x+13$
$-24t^2-2t+6t^3+8$
$\left(-1\right)\cdot\left(-2\right)\cdot\left(8\right)$
$4\left(-a+b\right)+2c-4d$
$5x^25.1x+20$
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