8.
在平面直角坐标系中,以原点\(O\)为极点,\(x\)轴的正半轴为极轴建立极坐标系,曲线\(C_{1}\)的极坐标方程为\(ρ^{2}(1+3\sin ^{2}θ)=4\),曲线\(C_{2}\):\(\begin{cases} x=2+2\cos θ, \\ y=2\sin θ \end{cases}(θ\)为参数\()\).
\((\)Ⅰ\()\)求曲线\(C\)\({\,\!}_{1}\)
的直角坐标方程和\(C\)\({\,\!}_{2}\)
的普通方程; \((\)Ⅱ\()\)极坐标系中两点\(A(ρ\)\({\,\!}_{1}\),\(θ\)\({\,\!}_{0}\)\()\),\(B\)\(\left( \left. ρ_{2},θ_{0}+ \dfrac{π}{2} \right. \right)\)都在曲线\(C\)\({\,\!}_{1}\)上,求\( \dfrac{1}{ρ\rlap{_{1}}{^{2}}}\)\(+\)\( \dfrac{1}{ρ\rlap{_{2}}{^{2}}}\)的值.