$\left(r-1\right)^2$
$\left(f+5\right)\left(f-25\right)$
$-4-96-57$
$\frac{dy}{dx}=\frac{xy}{2\ln\left(y\right)}$
$y^2+x^2y=0$
$\frac{sin^2x}{tan^2x}=\frac{1+cos\:2x}{2}$
$+7-\left(-3\right)+2$
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