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In DeltaABC,sum(r+r1)tan((B-C)/2)=...

In `DeltaABC,sum(r+r_1)tan((B-C)/2)=`

A

`(abc)/Delta^3`

B

0

C

`4Rr^2`

D

`1//r`

Text Solution

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The correct Answer is:
B
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