$\frac{-x^2}{x+1^2}$
$\frac{1}{25}a^6+4a^2$
$8-\left(-2\right)+7-2$
$65+6-\left(-1\right)+5$
$x^2\left(x^2-2x+2\right)$
$\sin\left(x\right)\left(1-\sin^2\left(x\right)\right)$
$\sqrt[4]{4x^2}$
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