If the circle x2+y2=a2 intersects the hyperbola xy=c2 in four points P – InterviewSolution

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1.	If the circle x2+y2=a2 intersects the hyperbola xy=c2 in four points P(x1,y1), Q(x2,y2) R(x3,y3), S(x4,y4), then which of the following need not hold?
Answer» If the circle $x^{2} + y^{2} = a^{2}$ intersects the hyperbola $x y = c^{2}$ in four points $P (x_{1}, y_{1}), Q (x_{2}, y_{2}) R (x_{3}, y_{3}), S (x_{4}, y_{4})$ , then which of the following need not hold?

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