①One____1st ②____ ____ 2rd ③three____ ____
④____ fourth____ ⑤five____ 5th
已知圆C1:(x+3)2+(y+4)2=4
(1)求与圆C1关于原点对称的圆C2的方程;
(2)求圆C1与圆C2的外公切线的方程.