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If sinA+sinB+sinC=0 and cosA+cosB+cosC...

If sinA+sinB+sinC=0
and cosA+cosB+cosC=0,
then cos(A+B)+cos(B+C)+cos(C+A) is equal to

A

Option1 (A+B+C)

B

Option2 2

C

Option3 1

D

Option4 0

Text Solution

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The correct Answer is:
D
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