$-7.4w^2z\left(2.6wz^3-1.3z^2\right)$
$\sqrt[4]{x^8}y^{12}$
$\sqrt[n]{7^{2n}}$
$s^2-22s+11$
$\lim_{x\to-2}\:\:x^2-4\:\:x+2$
$\frac{dy}{dx}=\:36x\:+\:42y\:-\:4x^2\:-\:2xy\:-\:4y^2\:-\:20$
$\frac{x^2+2x-3}{x^2-x-2}$
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