$2\cdot x\cdot y\cdot\frac{dy}{dx}=\frac{1}{y^2}$
$4x^2y^4-1$
$2sen^2w-sen^4w$
$\left(-1+x^7\right)\left(1+x^7\right)$
$\left(5x+6\right)\left(x+3\right)$
$-1.46+-3.82+7.99$
$\left(9a^3-1\right)^2$
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