Removed an extra 'so' to improve readability.
Changed caption of Figure 8.1 to improve clarity.

Seems like either 'coincide' or 'are concident' would work here.
Fix run-on sentence in Example 8.1.3.
Correct definiton of p(t) in Figure 8.4.
Merge branch 'textbook-8.2' of https://github.com/clark-archer/mooculus into development
Merge branch 'textbook-8.1' of https://github.com/clark-archer/mooculus into development
textbook updated