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यदि `DeltaABC` में, `2b^(2)=a^(2)+c^(2)` हो, तो `(sin 3B)/(sinB)` का मान होगा -

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यदि `DeltaABC` में, `2b^(2)=a^(2)+c^(2)` हो, तो `(sin 3B)/(sinB)` का मान होगा -
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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Correct Answer - d
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