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If cosC + cosD = x, then value of x is

2cos[(C+D)/2]cos[(C-D)/2]
2sin[(C+D)/2]sin[(C-D)/2]
2cos[(C+D)/2]sin[(C-D)/2]
2sin[(C+D)/2]cos[(C-D)/2]

Correct Answer: 2cos[(C+D)/2]cos[(C-D)/2]

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