Find the equations of direct common tangents for two circles
x2 + y2 + 6x − 2y + 1 = 0, x2 + y2 − 2x − 6y + 9 = 0
Find the equations of transverse common tangents for two circles
x2 + y2 + 6x − 2y + 1 =0 , x2 + y2 − 2x − 6y + 9 = 0