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

If `2tan^(2)theta_(1)tan^(2)theta_(2)theta_(3)+tan^(2)theta_(1)tan^(2)theta_(2)+tan^(2)theta_(1)tan^(2)theta_(3)+tan^(2)theta_(2)tan^(2)theta_(3)=1`, then find the value of `cos2theta_(1)+cos2theta_(2)+cos2theta(3)`

A

`0`

B

`1`

C

`2`

D

`3`

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