If sinA+sinB+sinC=cosA+cosB+cosC=0, then...

If `sinA+sinB+sinC=cosA+cosB+cosC=0,` then (A)`cos(A-B)=-1/2` (B) `sin^2A+sin^2 B+sin^2 C=0`(C) `sin^2A+sin^2 B+sin^2 C=3/2` (D) `cos^2A+cos^2B+cos^2C=3/2`

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