7.
已知圆\(O\):\(x^{2}+y^{2}=1\)和抛物线\(E\):\(y=x^{2}-2\),\(O\)为坐标原点.
\((\)Ⅰ\()\)已知直线\(l\)和圆\(O\)相切,与抛物线\(E\)交于\(M\),\(N\)两点,且满足\(OM⊥ON\),求直线\(l\)的方程;
\((\)Ⅱ\()\)过抛物线\(E\)上一点\(P(x_{0},y_{0})\)作两直线\(PQ\),\(PR\)和圆\(O\)相切,且分别交抛物线\(E\)于\(Q\),\(R\)两点,若直线\(QR\)的斜率为\(-\sqrt{3}\),求点\(P\)的坐标.
选考题