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tan^(- 1)(x+2/x)-tan^(- 1)(4/x)=tan^(- 1...

`tan^(- 1)(x+2/x)-tan^(- 1)(4/x)=tan^(- 1)(x-2/x)`

A

`sqrt(3)`

B

`-sqrt(3)`

C

`-sqrt(2)`

D

`sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
C, D
Given equation can be written as `(4x)/(x^(4)+x^(2)-4)-4/x=0`
`implies x=+-sqrt(2)`
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