$.5^3-2$
$\frac{d}{dx}y=x^2e^{2x}$
$81w^2-36w\cdot z+4z^2$
$\lim_{x\to0}\left(\frac{xsin4x}{1-cos^3x}\right)$
$\int\:\frac{x-2}{\:\sqrt{4x-x^2}}dx$
$\left(xcost\:-ysent\right)^2$
$10x+9=4x-9$
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