$\left(13a^4\right).\left(-5b^4\right)$
$-\left(3x+9\right)^2$
$y\cdot\frac{dy}{dx}=5x$
$\left(7^{-8}\right)\left(7^1\right)$
$-\left[-2+-2+\left(2-3\right)-2-3+4\left[-\left(-2\right)+3\right]\right]$
$\left(3m-3y\right)^2$
$\left(-3x+4y^2\right)^2$
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