1+ cos 56^(@) +cos 58^(@)- cos 66^(@)=...

`1+ cos 56^(@) +cos 58^(@)- cos 66^(@)`=

A

`2 cos 28^(@) cos 29^(@) cos 33^(@)`

B

`4 cos 28^(@) cos 29^(@) cos 33^(@)`

C

`4 cos 28^(@) cos 29^(@) sin 33^(@)`

D

`2 cos 28^(@) cos 29^(@) sin 33^(@)`

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The correct Answer is:

C

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