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In triangle ABC, if |[1,1,1], [cot (A/2)...

In triangle ABC, if `|[1,1,1], [cot (A/2), cot(B/2), cot(C/2)], [tan(B/2)+tan(C/2), tan(C/2)+ tan(A/2), tan(A/2)+ tan(B/2)]|` then the triangle must be (A) Equilateral (B) Isoceless (C) Right Angle (D) none of these

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