$\frac{dy}{dx}=-\frac{7y^2}{x^7}$
$\left(3x-1\right)\left(3x+4\right)$
$6x^2+13x+6$
$\left(9p^3+7x^4\right)^2$
$a^2=36$
$4x^4-12x^3$
$\sqrt{12^2+5^2}+\sqrt{10^2-8^2}$
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