$\left(7x^3y^2-4\right)\left(7x^3y^2+7\right)$
$0+2x$
$135\cdot6$
$d^2=69$
$a^4-5a^2+25$
$8x^2z^3y^6-4x^5z^2y^5+2x^4z^4a^3$
$\frac{d}{dx}9x^3\:+\:9y^3\:=\:3$
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