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If in a triangle A B C ,acos^2(C/2)ccos^...

If in a triangle `A B C ,acos^2(C/2)ccos^2(A/2)=(3b)/2,` then the sides `a ,b ,a n dc` `` are in A.P. b. are in G.P. c. are in H.P. d. satisfy `a+b=cdot`

A

A.P.

B

G.P.

C

H.P.

D

none of these

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