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If matrix `A=[[a,b,c],[b,c,a],[c,a,b]]`[where a, b, c are real positive numbers, abc=1 and `A^TA=I`, then the value of `a^3 + b^3 + c^3=`
A. |
1 |
B. |
2 |
C. |
4 |
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D. |
3 |