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જો tan^-1sqrt((ar)/(bc))+tan^-1sqrt((br)...

જો `tan^-1sqrt((ar)/(bc))+tan^-1sqrt((br)/(ca))+tan^-1sqrt((cr)/(ab))=pi` અને a,b,cr>0 તો a+b+c=_________

A

2r-a

B

r

C

2r-b

D

`2r+c`

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