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In a triangle ABC, if (1+(a)/(b)+(c)/(b...

In a triangle ABC, if `(1+(a)/(b)+(c)/(b))(1+(b)/(c)-(a)/(c))=3,` then the angle A is

A

`pi/3`

B

`pi/4`

C

`pi/6`

D

none of these

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A
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