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theta=tan^-1(2tan^2theta)-tan^-1{(1/3)ta...

`theta=tan^-1(2tan^2theta)-tan^-1{(1/3)tantheta}`, if

A

`tantheta=-2`

B

`tantheta=0`

C

`tantheta=1`

D

`tantheta=2`

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A, B, C
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