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For the equation 2x=tan(2tan^(-1)a)+ 2ta...

For the equation `2x=tan(2tan^(-1)a)+ 2tan \ (tan^(-1)a+tan^(-1)a^3)` , which of the following is/are invalid?
a.`a^2x+2a=x` b. `a^2+2a x+1=0` c.`a!=0` d. `a!=-1,\ 1`

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