2 answers
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two log rules:
log (A^n) = n logA
log(A/B) = logA - logB
your last line has mismatched brackets, should be
ln( (2x-1)^(1/2) / (x+1)^2) )
you can always check: then number of "(" brackets must be the same
as the number of ")" brackets in your expression or equation