The coordinates of the foci of the rectangular hyperbola \[xy={{c}^{2}

1.	The coordinates of the foci of the rectangular hyperbola \[xy={{c}^{2}}\] are
A.	\[(\pm c,\ \pm c)\]
B.	\[(\pm c\sqrt{2},\ \pm c\sqrt{2})\]
C.	\[\left( \pm \frac{c}{\sqrt{2}},\ \pm \frac{c}{\sqrt{2}} \right)\]
D.	None of these
Answer» C. \[\left( \pm \frac{c}{\sqrt{2}},\ \pm \frac{c}{\sqrt{2}} \right)\]

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The coordinates of the foci of the rectangular hyperbola \[xy={{c}^{2}}\] are

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