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[" If "tan^(-1)(1)/(a-1)=tan^(-1)(1)/(x)...

[" If "tan^(-1)(1)/(a-1)=tan^(-1)(1)/(x)+tan^(-1)(1)/(a^(2)-x+1)," then "x=],[[" (a) "a," (b) "a^(2)+a-1," (c) "a-1," (d) "a^(2)-a+],[" [ "a," b "]],[hline" ] "c]

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