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Lengths of the tangents from A, B, and C...

Lengths of the tangents from A, B, and C to the incircle are in A.P., then

A

`r_(1),r_(2),r_(3)` are in H.P

B

`r_(1),r_(2),r_(3)` are in A.P

C

a,b,c are in A.P

D

`coaA=(4c-3b)/(2c)`

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The correct Answer is:
A, C, D
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