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Express cos A-cosB+cos C-cos(A+B+C) in t...

Express `cos A-cosB+cos C-cos(A+B+C)` in the product form.

Text Solution

Verified by Experts

The correct Answer is:
`= 4 "sin" (A+B)/2 "sin" (B+C)/2 "cos"(C+A)/2`
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