March 2023
Beginner
400 pages
9h 38m
English
Content preview from Trigonometry For Dummies, 3rd Edition
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Chapter 14
Investigating Inverse Trig Functions
IN THIS CHAPTER
Acquainting yourself with inverse notation
Setting limits on inverse trig functions
Determining domain and range of inverse trig functions
As thrilling and fulfilling as the original six trig functions are, they just aren’t complete without their inverses. An inverse trig function behaves like the inverse of any other type of function — it undoes what the original function did. In mathematics, functions can have inverses if they’re one-to-one, meaning each output value occurs only once. This whole inverse idea is going to take some fast talking when it comes to trig functions, because they keep repeating values over and over as angles are formed with every full rotation of the circle — so you’re going to wonder how these functions and inverses can be one-to-one. If you need a refresher on basic inverse functions, just refer to the section on inverses in the Appendix for the lowdown on them and how you determine one.
Writing It Right
You use inverse trig functions when you want to know what angle is involved in equations such as or , or . In typical algebra equations, you can solve for the value of x by dividing ...
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