（a）找到圆C：x^2+y^2-6x+2y-6=0 到直线x+y=14的最短距离；
（b）找出穿过点(0,3)并与（a）中圆C相切的直线.
题目简单了,自己做吧
(a) Find the shortest distance from the circle C x^2+y^2-6x+
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