$\left(3-1\right)\left(-5+5\right)$
$25n^2-121m^2$
$\left(x+\frac{1}{2}y\right)^2$
$3+2c+5c+2$
$\left(j^2-2j\right)$
$\frac{d^3}{dx^3}\left(x^4-sen\left(x\right)\right)$
$81-25x^2y^2$
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