If , , are in GP then roots of x^2+2 x+1=0 are always

JEE Advanced Mathematics question

If are in GP then roots of are always

Answer: (B)

GP condition: . Then

2φ=1-2φ=1-2θθ=1-2θ=(θ-θ .

Discriminant of the quadratic:

D=4φ-4===4({\

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Question ID VK-107938