Cofficient of x^6 in (e^(ix)+e^(-ix))/2 ...

Cofficient of `x^6` in `(e^(ix)+e^(-ix))/2` is

A

`{:(A,B,C,D),(1,4,3,2):}`

B

`{:(A,B,C,D),(4,1,2,3):}`

C

`{:(A,B,C,D),(4,1,3,2):}`

D

`{:(A,B,C,D),(1,4,2,3):}`

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The correct Answer is:

C

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