Find the parametric equation of the circles : `x^2 + y^2 + 2x - 4y - 1 =0`

Find the parametric equation of the circles : x^2 +y^2 =9

Find the parametric equation of the circles : x^2 + y^2 - 2x+4y-4=0

Find the parametric equation of the circles : 3x^2 + 3y^2 + 4x-6y - 4 = 0

Find the parametric equations of that circles : 3x^2 + 3y^2 =4

Find the parametric equations of that circles : 2x^2 + 2y^2 - 5x - 7y-3=0

Find the parametric equations of the circles x^(2)+y^(2)=16 .

Find the parametric equation of the circles : (i) 2x^(2) + 2y^(2) - 5x - 7y - 3 = 0 (ii) 3x^(2) + 3y^(2) + 4x - 6y - 4 = 0 .

The parametric equations of the circle x^(2) + y^(2) + mx + my = 0 are