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Value of 1 + cos 56^@+ cos 58^@ - cos 66...

Value of `1 + cos 56^@+ cos 58^@ - cos 66^@` is:

A

`4cos28^@ cos29^@ sin 33^@`

B

`4cos28^@ sin 29^@ sin 33^@`

C

`4sin28^@ cos 29^@ cos33^@`

D

`4cos28^@ sin 29^@ sin 33^@` .

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