If 
then show that a, b, c, and d are in G.P.
Given: 
To Prove: a, b, c, and d are in G.P
Proof:
Applying componendo and dividend to the given expression, we get,
Clearly, a, b, c, and d are in G.P.
Hence, Proved.
16
If then show that a, b, c, and d are in G.P.
Given:
To Prove: a, b, c, and d are in G.P
Proof:
Applying componendo and dividend to the given expression, we get,
Clearly, a, b, c, and d are in G.P.
Hence, Proved.