Answer :
As
a, b, c are in G.P, let r be the common ratio.
Therefore,
b = ar … (1)
c = ar2 … (2)
To prove: 
As, LHS = 
⇒ LHS = 
⇒ LHS = 
⇒ LHS = 
As, RHS = 
= LHS
Clearly, LHS = RHS
Hence proved
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