Determining Values of Trigonometric Functions

It is true that you can look up the values of trigonometric functions in the trigonometric tables found in Appendix D. However, you probably noticed that these values are approximate values, and you have to decide to what degree of accuracy you need to use the values of trigonometric functions.

For many problems you will encounter in the future, you will often find it is more convenient to use the exact values of trigonometric functions even if they contain radicals, or square root symbols. For example, in many calculations it is easier to use 62-3.png for cos30º instead of referring to Appendix D and obtaining ...

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