Complex Numbers And Quadratic Equations question 219
Question: If $ \cos \alpha +\cos \beta +\cos \gamma =0= $ $ \sin \alpha +\sin \beta +\sin \gamma $ then $ \cos 2\alpha +\cos 2\beta +\cos 2\gamma $ equals [RPET 2000]
Options:
A) $ 2\cos (\alpha +\beta +\gamma ) $
B) $ \cos 2(\alpha +\beta +\gamma ) $
C) 0
D) 1
Show Answer
Answer:
Correct Answer: C
Solution:
See solution of above question.
BETA
