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Question

In ABC, lf aCos2C2+cCos2A2=3b2, then a, b, c are in

A
A.P.
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B
G.P.
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C
H.P.
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D
A.G.P.
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Solution

The correct option is A A.P.
a(1+cosC)2+c(1+cosA)2=3b2
acosC+ccosA=3bac
b=3bac
a+c2=b
a, b, c, are in AP.
(b=acosC+ccosA)

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