## grobles27 find the derivative of ln ((square root of x^2 +1)/(x(2x^3-1)^2)) one year ago one year ago

1. zepdrix

$\large \ln\left(\frac{\sqrt{x^2+1}}{x(2x^3-1)^2}\right)$ So this is what our problem looks like? Oh boy this one is gonna be a doozy. We'll have to apply the chain rule, and then the pruduct rule, and then the chain rule a few more times.

2. zepdrix

The derivative of natural log gives us,$\large \left(\ln \heartsuit\right)'=\frac{1}{\heartsuit}\heartsuit'$I wanted to use some besides x, Whatever the contents of the log may be, you stuff all of that into the denominator. The prime on the outside is due to the chain rule. we have to multiply by the derivative of the inside of the log. The little prime is to let us know we still need to differentiate it. So if we apply this idea to our problem, here's what we get! :O

3. zepdrix

$\large \frac{d}{dx}\ln\left(\frac{\sqrt{x^2+1}}{x(2x^3-1)^2}\right)\quad = \quad$ $\large \frac{1}{\left(\frac{\sqrt{x^2+1}}{x(2x^3-1)^2}\right)}\frac{d}{dx}\left(\frac{\sqrt{x^2+1}}{x(2x^3-1)^2}\right)$

4. dpaInc

looks like a lot of work... try simplifying $$\large ln(\frac{\sqrt{x^2+1}}{x(2x^3-1)^2})$$ using the properties of logs first...

5. zepdrix

Ah yes, that would be better -_- woops!