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If cos(x+pi//3)+cosx=a has real solution...

If `cos(x+pi//3)+cosx=a` has real solutions, then

A

a number of integral values of a is 3

B

sum of number of integral values of a is 0.

C

when a=1, number of solutions for `x in [0,2pi[` are 3

D

when a=1, number of solutions for `x in [0,2pi]` are 2

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The correct Answer is:
A, B, D
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