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In triangle ABC, the value of [a^(3) cos...

In triangle ABC, the value of `[a^(3) cos (B-C)+b^(3) cos (C-A) +c^(3) cos (A-B) ]` is-

A

`abc`

B

`a+b+c`

C

`3abc`

D

0

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The correct Answer is:
C
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