Equation of tangent drawn to circle `|z| = r` at the point `A(z_0)`, is

Equation of tangent drawn to circle abs(z)=r at the point A(z_(0)) , is

The equation of tangent to the circle x^(2)+y^(2)-r^(2)=0 at a point on it (whose parameter is theta ) is

The equation of pair of tangents drawn from the point (0,1) to the circle x^(2) + y^(2) – 2x + 4y = 0 is–

PA and PB are the two tangents drawn on a circle from and external point P. The centre of the circle is O and the tangents touches the circles at points A and B. Then quadrilateral OAPB is-

The equation of pair of tangents drawn from an external point P(x_(1),y_(1)) to circle S=0 is