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Let alpha , beta , gamma parametric ang...

Let `alpha , beta , gamma ` parametric angles of 3 points P,Q and R respectively lying on `x^(2)+y^(2)=1 `. If the length of chords AP, AQ and AR are in GP where A is (-1,0), then `[Given , alpha , beta ,gamma in (0,2pi)]`.

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A, D
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