A number of phrases for addressing the reader or including the reader in your discussion are given in the PhraseBook. These include:
Addressing the reader
Consider, for example, …
Now consider the issue of …
Note that …
Using we to include the reader or audience
As mentioned above, using we to include the reader or listener is common in textbooks and teaching:
What can we say about …?
What does this tell us about …?
This brings us to the question of …
Let us now examine the question of …
Other ways of including the reader
What is the explanation for this?
How might … be explained?
One might ask, for example, whether …?
It should be noted that …
It is important not to overlook that …