If cosA + cosB + cosC = 3, then what is the value of sinA + sinB + sinC?

A. 1

B. 2

C. 0

D. -1

Answer: Option C

Solution(By Examveda Team)

cosA + cosB + cosC = 3
⇒ putting A, B, C = 0
1 + 1 + 1 = 3
3 = 3 Satisfied
So, sinA + sinB + sinC
= sin0° + sin0° + sin0°
= 0 + 0 + 0
= 0