An irrational number $\sqrt{2}$ and a fraction $1-\frac{1}{2}$
and a fact about $\pi$:$\frac2\pi = \frac{\sqrt2}2 \cdot \frac{\sqrt{2+\sqrt2}}2 \cdot \frac{\sqrt{2+\sqrt{2+\sqrt2}}}2 \cdots$
Show Example 5
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