flute40661 flute40661

08-03-2024
Mathematics

contestada

If cos a + cos ß + cos y = sin a + sin ß + sin y = 0 then cos 3a + cos 3ẞ + cos 3y
equals to
A. o
B. cos(a + B + y)
C. 3 cos(a + B + y)
D. 3 sin(a + ß + y)

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