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In DeltaABC, " if " b^(2) + c^(2) = 2a^(...

In `DeltaABC, " if " b^(2) + c^(2) = 2a^(2)`, then value of `(cotA)/(cot B + cot C)` is

A

`1/2`

B

`3/2`

C

`5/2`

D

`5/3`

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