2．
先观察下列等式，再回答下列问题：
\(① \sqrt {1+ \dfrac {1}{1^{2}}+ \dfrac {1}{2^{2}}}=1+ \dfrac {1}{1}- \dfrac {1}{1+1}=1 \dfrac {1}{2}\)； \(② \sqrt {1+ \dfrac {1}{2^{2}}+ \dfrac {1}{3^{2}}}=1+ \dfrac {1}{2}- \dfrac {1}{2+1}=1 \dfrac {1}{6}\)
\(③ \sqrt {1+ \dfrac {1}{3^{2}}+ \dfrac {1}{4^{2}}}=1+ \dfrac {1}{3}- \dfrac {1}{3+1}=1 \dfrac {1}{12}\)
\((1)\)请你根据上面三个等式提供的信息，猜想\( \sqrt {1+ \dfrac {1}{4^{2}}+ \dfrac {1}{5^{2}}}\)的结果，并验证；
\((2)\)请你按照上面各等式反映的规律，用含\(n\)的等式表示\((n\)为正整数\()\)．