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cos C - cos D=...

cos C - cos D=

A

`2"sin" (C+D)/2 "cos"(C-D)/2`

B

`2 " cos"(C+D)/2 "sin" (C-D)/2`

C

`2 "cos" (C+D)/2 "cos" (C-D)/2`

D

`2 "sin" (C+D)/2 "sin" (D-C)/2`

Text Solution

Verified by Experts

The correct Answer is:
D
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