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OpenStudy (anonymous):
Define ln x and deduce that ln xy/z^2 = ln x + ln y - 2 lnz
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OpenStudy (anonymous):
got as far as \[\ln x = \int\limits_{1}^{x} { 1 \over t} dx\]
OpenStudy (anonymous):
i'm guessing I need a suitable substitution for t but not sure how to proceed
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