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

Let `alpha` be a real number such that `0 <= alpha <= pi.` If `f(x)=cosx+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 (Note : [y] denotes greatest integer less than or equal to y.)

A

0

B

1

C

-1

D

2

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The correct Answer is:
A
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