1.

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

A. 2cos[(C+D)/2]cos[(C-D)/2]
B. 2sin[(C+D)/2]sin[(C-D)/2]
C. 2cos[(C+D)/2]sin[(C-D)/2]
D. 2sin[(C+D)/2]cos[(C-D)/2]
Answer» B. 2sin[(C+D)/2]sin[(C-D)/2]


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