$$2 ^ { 2 } + 3 ^ { 2 } + 6 ^ { 2 } \quad = 7 ^ { 2 }$$
$\text{true}$
$$4+3^{2}+6^{2}=7^{2}$$
$$4+9+6^{2}=7^{2}$$
$$13+6^{2}=7^{2}$$
$$13+36=7^{2}$$
$$49=7^{2}$$
$$49=49$$
$$\text{true}$$
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