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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. \[{{t}_{1}}{{t}_{3}}={{t}_{2}}{{t}_{4}}\] | |