Homework Help: Root integral question

1. Feb 18, 2009

transgalactic

$$\int \frac{dx}{x(1+2\sqrt{x}+\sqrt[3]{x})}=\int \frac{dx}{x(\sqrt{x}+1+\sqrt{x}+\sqrt[3]{x})}= \int \frac{dx}{x(\sqrt{x}+\frac{(1-x)}{1-\sqrt[3]{x}})}$$
i got read of one root but instead i got another one
??

Last edited: Feb 18, 2009
2. Feb 18, 2009

Tom Mattson

Staff Emeritus
Notice that the denominator can be written as follows:

$$x\left(1+2x^{1/2}+x^{1/3}\right)$$

$$x\left(1+2x^{3/6}+x^{2/6}\right)$$

Let $u=x^{1/6}$.