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The Complete Idiot's Guide to Trigonometry by Izolda Fotiyeva, Ph.D., Izolda Fotiyeva, Dmitriy Fotiyev

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Evaluating Trigonometric Functions

After following extensive proofs and algebraic solution steps in the previous chapters of this book, you must be relieved that you have gotten to the simple part. Calculators do indeed make it easy to evaluate trigonometric functions. However, you do need to keep in mind a few key trigonometric concepts.

Most calculators default their trigonometry calculators in radians. In order to perform calculations in degrees, you must use the two conversion formulas provided in Chapter 8:

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Some calculators make life easier by having a setting that can toggle between calculations in radian and degree modes. This can be accomplished ...

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