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Set of all values of x such that (lim)(x...

Set of all values of `x` such that `(lim)_(xvecoo)1/(1+((4tan^(-1)(2pix))/pi)^(4n))` is non-zero and finite number when `n in N` is `(0,1/(2pi))` b. `(-1/pi,1/pi)` c. `[1/(2pi),1/(2pi)]` d. `(-1/(2pi),0)`

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