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\[\frac{x+y}{1+ \frac{y}{z+1}}\]
\[ x= \frac{y+z/2}{y^{2}+1 } \]
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\[\frac{x+y}{1+ \frac{y}{z+1}}\]
\[ x= \frac{y+z/2}{y^{2}+1 } \]
