1.

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 .

Answer»

`(11sqrt7)/15`
`(4 SQRT7)/5`
`2/3 sqrt7`
`sqrt7`

ANSWER :a


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