\((1)\)在柱坐标系中,长方体的两个顶点坐标为\(A_{1}(4,0,5)\),\(C_{1}(6, \dfrac{π}{2} ,5)\),则此长方体外接球的表面积为________________.
\((2)\)函数\(f(x)=-x^{3}+4x\)在点\((1,f(1))\)处的切线方程是_____.
\((3)\)在平面直角坐标系中,以坐标原点为极点,\(x\)轴的非负半轴为极轴建立极坐标系\(.\)已知曲线\(C\):\(ρ=\cos θ+\sin θ\),直线\(l\):\(\begin{cases}x= \dfrac{1}{2}- \dfrac{ \sqrt{2}}{2}t \\ y= \dfrac{ \sqrt{2}}{2}t\end{cases} (t\)为参数\().\)曲线\(C\)与直线\(l\)相交于\(P\),\(Q\)两点,则\(|PQ|=\)__.
\((4)\)已知抛物线\(y^{2}=12x\)的焦点为\(F\),若点\(A\),\(B\)是该抛物线上的点,\(∠AFB= \dfrac{π}{2} \),线段\(AB\)的中点\(M\)在抛物线的准线上的射影为\(N\),则\( \dfrac{\left|MN\right|}{\left|AB\right|} \)的最大值为__.