Ebatzi: f (complex solution)
f=\sqrt{\frac{x+1}{1-x}}
x\neq 1
Ebatzi: x (complex solution)
x=-\frac{1-f^{2}}{f^{2}+1}
f\neq i\text{ and }\left(f=0\text{ or }arg(f)<\pi \right)\text{ and }f\neq -i
Ebatzi: f
f=\sqrt{\frac{x+1}{1-x}}
x\geq -1\text{ and }x<1
Ebatzi: x
x=-\frac{1-f^{2}}{f^{2}+1}
f\geq 0
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