$9a^2-6ab+b^2$
$sin\left(\frac{\pi}{6}+x\right)=\frac{1}{2}\left(cos\:x+\sqrt{3}sinx\right)$
$\frac{y^3}{27}-125z^6$
$\frac{x^2y}{x^2}$
$4t^2+15t+9$
$\frac{dy}{dx}=-\frac{1}{x}y=x^2\:sinx$
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