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If in a DeltaABC, the tangent of half th...

If in a `DeltaABC`, the tangent of half the difference of two angles is one-third the tangent of half the sum of the angles. Then, the ratio of the sides opposite to the angles is

A

`2:1`

B

`1:2`

C

`3:1`

D

`1:1`

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A
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