$$\frac { } { 1 ^ { 2 } + 2 ^ { 2 } }$$
$\frac{1}{5}=0.2$
$$\frac{1}{1+2^{2}}$$
$$\frac{1}{1+4}$$
$$\frac{1}{5}$$
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$\frac{1}{5} = 0.2$
