[" 5.The set "],[{Re((2iz)/(1-z^(2))):z"...

[" 5.The set "],[{Re((2iz)/(1-z^(2))):z" is a complex number,"|z|=1,z!=+-1}" ,is "],[[" (a) "(-oo,-1)(1,oo)," (b) "(-oo,0)uu(0,oo)],[" (c) "[2,oo)," (4,"quad AA(x)(-oo,-1)uu[1,oo)]]

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