1.

For the equation 2x=tan(2tan^(-1)a)+2tan(tan^(-1)a+tan^(-1)a^(3)), which of the following is valid ?

Answer»

`a^(2)x+2a=x`
`a^(2)+2ax+1=0`
`a!=0`
`a=-2,2`

ANSWER :A


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