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Let alpha be a real number such that 0 ...

Let `alpha` be a real number such that `0 le alpha le pi`. If `f(x)=cos x+cos(x+alpha)+cos(x+2alpha)` takes some constant number c for any ` x in R`, then the value of `[c+alpha]` is equal to

A

0

B

1

C

-1

D

2

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The correct Answer is:
A
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