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If A , B ,C are angles of a triangle, th...

If `A , B ,C` are angles of a triangle, then the value of `|[e^(2i A),e^(-i C),e^(-i B)],[e^(-i C),e^(2i B),e^(-i A)],[e^(-i B),e^(-i A),e^(2i C)]|` is (a)`1` (b) `-1` (c) `-2` (d) `-4`

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