$\left(7x-1\right)^2-\left(9x-2\right)^2$
$x\frac{dy}{dx}=tany$
$\frac{dy}{dx}=\frac{y^2+1}{x^2}$
$\frac{0}{4}+5$
$\left(2x^2-x\right)^2-2\left(x+1\right)$
$\left(x^2-20\right)^2$
$9x^2+126x+49$
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