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Question

If z1,z2,z3 represent the vertices of an equilateral ΔABC and |z2z1|2+|z3z1|2|z2+z32z1|2+|z3z2|2=sin θ (where 0<θ<π) then θ is

A
π4
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B
2π3
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C
π6
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D
5π6
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