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