[" The equation "ax^(2)+2hxy+ay^(2)=0" represent "],[" pair of coincident lines if : "]

The equation ax^(2)+2hxy+ay^(2)=0 represents a pair of coincident lines through origin, if

The equation 4x^(2)+hxy+y^(2)=0 represents a pair of coincident lines through origin, if h=

The equation ax^(2)+2hxy+by^(2)=0 represents a pair of perpendicular lines if

If the equation ax^(2)+hxy+by^(2)+4gx+6fy+4c=0 represents a pair of lines then

If the equation ax^(2)+by^(2)+cx+xy=0 represents a pair of line, then

The value of h for which 3x^(2)-2hxy+4y^(2)=0 represents a pair of coincident lines are

If the equation ax^(2)+ay^(2)+2gx+2fy+c=0 represents a pair of lines then

Let the equation ax^(2)+2hxy+by^(2)=0 represents a pair of straight lines then the angle theta - between the lines is given by cos theta=

If the equation x^(2)+2hxy+2fy+c=0 represents a pair of lines, then