Question 418452
<pre><font face = "consolas" color = "indigo" size = 4><b>
{{{"f(x)"=ln(1/x)}}}

Rewrite as

{{{"f(x)"=ln(x^(-1))}}}

Then rewrite as

{{{"f(x)"=-ln(x)}}}

{{{"f'(x)"=-1/x}}}

Edwin</pre>