(1) 
\begin{align} \label{eq:poly}
d_n=$\sqrt{a_n^2+b_n^2}
\end{align}
{align}을 안써주면 줄바꿈이 일어난다.
줄바꿈 내용 참조(align, align*, &)
http://cubequest.org/xe/index.php?document_srl=165972&mid=LaTex
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