$\frac{x^4-x^2-3x+2}{x-1}$
$-\left(-1\right)+\left(-1\right)-3$
$sen^2\theta\:=\frac{3}{4}$
$\sin\:\left(x+y\right)-\sin\:\left(x-y\right)$
$\left(3r^3+5a^4\right)^2$
$\left(+23\right)\:x\:\left(+44\right)$
$y^3+y^6-y^5$
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