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若\(P(2,-1)\)为圆\(O:\begin{cases}x=1+5\cos θ \\ y=5\sin θ\end{cases}\left(o\leqslant θ < 2π\right) \)的弦的中点,则该弦所在直线\(l\)的方程是
已知圆\(C_{1}\):\(x^{2}+(y-2)^{2}=4\),抛物线\(C_{2}\):\(y^{2}=2px(p > 0)\),\(C_{1}\)与\(C_{2}\)相交于\(A.B\)两点,且\(|AB|=\dfrac{8\sqrt{5}}{5}\),则抛物线\(C_{2}\)的方程为
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