Adam's Trig identity Proof Assignment

My Trig Identity Proof Tutorial for Question #39:

https://www.youtube.com/watch?v=2eV323Vzkgc

Example Video by Charlie Lindelof:

https://www.youtube.com/watch?v=rBPIun6DMQ8

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Greetings PreCalculus 30 students (2018 version).  Welcome to my PreCalculus Blog.  Please feel free to use this blog as a place to upload questions, concerns, insights and links to help in the topics we cover in class.