^{2}/9 + y

^{2}/4 = 1 find the set of all points from which

**the angle of view**of this ellipse is a right angle. What is the significance of this set of points?

^{*}
Given the equation x^{2}/9 - y^{2}/4 = 1 find the set of all points from which **the angle of view ^{*}** of this hyperbola is a right angle. What is the significance of this set of points?

* i.e. displaying a right angle between the two tangents.