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If tan x + tan 2x + tan 3x = 0 then whic...

If `tan x + tan 2x + tan 3x = 0` then which of the following can hold good ?

A

`sec^(2)x=1`

B

`cot^(2)x=2`

C

`tan^(2)x=3`

D

`"coses"^(2)x=3`

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