1.

If the coordinates of four concyclie points on the rectangular hyperbola \[xy={{c}^{2}}\] are \[(c{{t}_{i}},\,\,c/{{t}_{i}}),i=1,\,\,2,\,\,3,\,\,4\] then

A. \[{{t}_{1}}{{t}_{2}}{{t}_{3}}{{t}_{4}}=-1\]
B. \[{{t}_{1}}{{t}_{2}}{{t}_{3}}{{t}_{4}}=1\]
C. \[{{t}_{1}}{{t}_{3}}={{t}_{2}}{{t}_{4}}\]
D. \[{{t}_{1}}+{{t}_{2}}+{{t}_{3}}+{{t}_{4}}={{c}^{2}}\]
Answer» C. \[{{t}_{1}}{{t}_{3}}={{t}_{2}}{{t}_{4}}\]


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