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`alpha,beta and gamma` are parametric angles of three points P, Q and R respectively, on the circle `x^2 + y^2 = 1` and A is the point (-1, 0). If the lengths of the chords AP, AQ and AR are in GP, then `cos alpha/2, cos beta/2 and cos gamma/2` are in

A

A.P.

B

G.P.

C

H.P.

D

none of these

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The correct Answer is:
B
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