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If (2tan^(2)theta(1)tan^(2)theta(2)tan^(...

If `(2tan^(2)theta_(1)tan^(2)theta_(2)tan^(2)theta_(3)+tan^(2)theta_(1)tan^(2)theta_(2)+tan^(2)theta_(2)tan^(2)theta_(3)+tan^(2)theta_(3)tan^(2)theta_(1)=1` then which of the following relations hold good ?

A

`0`

B

`1`

C

`2`

D

`3`

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