1. There is an enormous number of uses of trigonometry and trigonometric functions . 2. With these definitions the trigonometric functions can be defined for complex numbers. 3. Euler's formula relates its values at purely imaginary arguments to trigonometric functions . 4. The three Indian functions are related to modern trigonometric functions as follows: 5. The advantage is that calculating the trigonometric functions directly can be avoided. 6. Most computer programming languages provide function libraries that include the trigonometric functions . 7. Many electronic calculators allow calculations of trigonometric functions in either degrees or radians. 8. These identities are useful whenever expressions involving trigonometric functions need to be simplified. 9. In mathematics, tables of trigonometric functions are useful in a number of areas. 10. This latter adds scientific and trigonometric functions to the otherwise basic calculator routines.
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