The number of points common to the circle x2+y2−4x−4y=1 and to the sides of the rectangle formed by x=2,x=5,y=−1 and y=5 is
5
1
2
3
(3) points
The common chord of the circle x2+y2+4x+1=0 and x2+y2+6x+2y+3=0 is