If in DeltaABC,2b^(2)=a^(2)+c^(2),"then ...

If in `DeltaABC,2b^(2)=a^(2)+c^(2),"then "(sin3B)/(sinB)`=

A

`(c^2-a^2)/(2ca)`

B

`(c^2-a^2)/(ca)`

C

`((c^2-a^2)/(ca))^2`

D

`((c^2-a^2)/(2ca))^2`

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The correct Answer is:

D

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