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If `A , B ,C` are angles of a triangles, 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`

A

1

B

-1

C

-2

D

-4

Text Solution

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The correct Answer is:
D
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