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[" 23.In triangle "ABC" ,the value of "[...

[" 23.In triangle "ABC" ,the value of "[a^(3)cos(B-C)],[+b^(3)cos(C-A)+c^(3)cos(A-B)]" is "],[[" (8) "abc," (B) "a+b+c" (c) "3abc," (b) "0]]

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