In a triangle \( A B C \) if \( \cos A+2 \cos B+\cos C=2 \). The sides of the triangle are in : ...

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In a triangle \( A B C \) if \( \cos A+2 \cos B+\cos C=2 \). The sides of the triangle are in :
(A) H.P.
(B) G.P.
P
W
(C) A.P.
(D) None of these
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