$3^2-3^2$
$4y^2-9y+2$
$x\left(x^2-x-1\right)+1$
$sin3x=-\:\frac{1}{2}$
$5xy5xy$
$\frac { - t ^ { 3 } + 3 t ^ { 2 } - 9 t } { 4 }$
$-8-\left(5-1\right)$
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