1.

{(x2– y2)2/ (1 – x2)(y2– 1)} + {(1–x2)2/ (x2–y2) (y2– 1)} + {(y2– 1)2/ (x2– y2) (y2– 1) = ?

A. 0
B. 1
C. 2
D. 3
Answer» E.


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