Trigonometry Workbook For Dummies
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The Pythagorean identities are building blocks for many of the manipulations of trigonometric equations and expressions. They provide a greater number of methods for solving trig problems more efficiently, because they allow you to write complicated expressions in a much simpler form.

The Pythagorean identities are

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The notation in these identities is peculiar to trigonometry.

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So they agreed on a condensed version: The superscript 2 right after “sin” means that you square the whole expression. The same type of notation also goes for the other functions.

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Mary Jane Sterling taught algebra, business calculus, geometry, and finite mathematics at Bradley University in Peoria, Illinois, for more than 30 years. She is the author of several For Dummies books, including Algebra Workbook For Dummies, Algebra II For Dummies, and Algebra II Workbook For Dummies.

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