Help! Test tomorrow.

**BigPapa** · December 2nd 2008, 12:42 PM

i have a test tomorrow and i need help with some of the questions on the review. i have like 5 of them. here is the first one.

Find the derivative of the function y=xTanh^-1(lnx)

**mr fantastic** · December 2nd 2008, 06:47 PM

Originally Posted by BigPapa

i have a test tomorrow and i need help with some of the questions on the review. i have like 5 of them. here is the first one.

Find the derivative of the function y=xTanh^-1(lnx)

You need to use both the chain rule and the product rule.

First use the product rule:

$u = x \Rightarrow \frac{du}{dx} = 1$ .

$v = \tanh^{-1} (\ln x) \Rightarrow \frac{dv}{dx} = ?$

To get $\frac{dv}{dx}$ you need to use the chain rule:

Let $w = \ln x \Rightarrow \frac{dw}{dx} = \frac{1}{x}$ and $v = \tanh^{-1} w$ .

Then $\frac{dv}{dx} = \frac{dv}{dw} \cdot \frac{dw}{dx} = \, ....$

Now put it all together.

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