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alpha,betaandgamma aer parametric angles...

`alpha,betaandgamma` aer 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))andcos((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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