**Evaluate**

Let us follow the steps

**1**- This is an indefinite integral
involving one function. The second needed function is
*g*(*x*) = 1. Since the derivative of this function is 0, the only choice left is to differentiate the other function . **2**- We have
which gives

**3**- We have the formula
**4**- Since
we get

Since the derivative of is 1/*x*, it is very common that whenever an integral involves a function which is a product of with another function, to differentiate and integrate the other function.

**
**

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