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If length of the sides of a triangle ABC are 4 cm, 5 cm and 6 cm, O is point inside the triangle ABC such that `angle OBC = angle OCA = angle OAB = theta`, then value of cot `theta` is .

A

`(11sqrt7)/15`

B

`(4 sqrt7)/5`

C

`2/3 sqrt7`

D

`sqrt7`

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