The total number of common tangents to the curve `y^(2)=4ax` and `x^(2)+y^(2)-2ax=0` is

The number of common tangents to the circles x^(2)+y^(2)-y=0and x^(2)+y^(2)+y=0 is

The number of common tangents of the circles x^(2) +y^(2) =16 and x^(2) +y^(2) -2y = 0 is :

The number of common tangents to the circles x^(2)+y^(2)-x=0 and x^(2)+y^(2)+x=0 are

The number of common tangents of the circles x^(2)+y^(2)+4x+1=0 and x^(2)+y^(2)-2y-7=0 , is

Total number of common tangents of y^(2) = 4ax " and " xy = c^(2) is / are

Number of common tangent with finite slope to the curves xy=c^(2) and y^(2)=4ax is:

The number of common tangents to the circle x^(2)+y^(2)-2x-4y-4=0 and x^(2)+y^(2)+4x+8y-5=0 is _________.

Area common to the curves y^(2)=ax and x^(2)+y^(2)=4ax is equal to