Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If sin A + sinB + sinC = cos A + cosB + cos C = 0. Then 2 cos (A – B) = – k. Then k is.
Text Solution
Verified by ExpertsThe correct answer is:
1
(1)
sin A + sin B = – sin C cos A + cos B = – cos C
on squaring and adding
2 + 2 cos (A –B) = 1
cos (A – B) = –1/2
2 cos (A – B) = – 1
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