The range of function y = (a ^ x-1) / (a ^ x + 1) (a > 0, and a ≠ 1)

Function y = (a ^ x-1) / (a ^ x + 1), (a > 0, and a ≠ 1)
=1-2/(a^x+1)
a^x>0,
a^x+1>1,
0

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