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If sumcosA=sumsinA=0 then find the valu...

If `sumcosA=sumsinA=0` then find the value of `x^(sin(2A-B-C))x^(sin(2B-C-A))x^(sin(2C-A-B))` is (A) 1 (B) 0 (C) 3 (D) -3

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