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x+1>0 → x>-1
x-1>0 → x>1
x-1≠0 → x≠1
czyli
x>1
log₂(x+1) - log(x-1) 4 ≤ 1
log₂(x+1) - log₂4/log₂(x-1) ≤ 1
log₂(x+1) - 2/log₂(x-1) ≤ 1
log₂(x+1) - 2/log₂(x-1) ≤ 1 /*log₂(x-1)²
log₂(x+1)log₂(x-1)²- 2log₂(x-1) ≤ log₂(x-1)²
log₂(x+1)log₂(x-1)²-log₂(x-1)²- 2log₂(x-1) ≤ 0
log₂(x-1)*(log₂(x+1)log₂(x-1)-log₂(x-1)-2) ≤ 0
i dalej nic z tym nie zrobimy, bo z "log₂(x+1)log₂(x-1)" nic nie da się zrobić :/