1.

If {(a2 + b2 + c2) / ( a2 – b2 – c2)} + {(b2 + c2 + a2) / b2 – c2–a2)} + {(c2 + a2 +b2) / (c2 – a2 –b2)} = ?

A. 0
B. 1
C. 3
D. – 1
Answer» B. 1


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