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The solution of the inequality (tan^(-1)...

The solution of the inequality `(tan^(-1)x)^2-3tan^(-1)x+2geq0` is
a.`(-oo,\ t a n1]uu[t a n2,\ oo)` b. `(-oo,\ t a n1]`
c.`(-oo,\ -t a n1]uu[t a n2,oo)` d. `[-1,\ 1]-\ (-(sqrt(2))/2,(sqrt(2))/2)`

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