如图,在平面直角坐标系中,\(O\)为坐标原点,\(\triangle ABO\)的边\(AB\)垂直于\(x\)轴,垂足为点\(B\),反比例函数\(y=\dfrac{k}{x}(x > 0)\)的图象经过\(AO\)的中点\(C\),交\(AB\)于点\(D\),且\(AD=3\).
\((1)\)设点\(A\)的坐标为\((4,4)\),则点\(C\)的坐标为________;
\((2)\)若点\(D\)的坐标为\((4,n)\),
\(①\)求反比例函数\(y=\dfrac{k}{x}\)的表达式;
\(②\)求经过\(C\),\(D\)两点的直线所对应的函数解析式;
\((3)\)在\((2)\)的条件下,设点\(E\)是线段\(CD\)上的动点\((\)不与点\(C\),\(D\)重合\()\),过点\(E\)且平行\(y\)轴的直线\(l\)与反比例函数的图象交于点\(F\),求\(\triangle OEF\)面积的最大值.