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The Calculus Lifesaver by Adrian Banner

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CHAPTER 2 ______________________________

Review of Trigonometry

To do calculus, you really need to know trigonometry. Truth be told, we won’t see much trig at first, but when it comes, it doesn’t let up. So we might as well do a thorough review of the most important aspects of trig:

• angles in radians and the basics of the trig functions;

• trig functions on the real line (not just angles between 0° and 90°);

• graphs of trig functions; and

• trig identities.

Time to refresh your memory….

2.1 The Basics

The first thing I want to remind you about is the notion of radians. Instead of saying that there are 360 degrees in a full revolution, we’ll say that there are 2π radians. This may seem a bit wacky, but there is a reason: the circumference of ...

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