What is Trigonometry?

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What is Trigonometry?

• Trigonometry is the study of periodic functions
  described by angles (input) and distances
  (output).

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Applications p. 107p. 82p. 83p.
142p. 143p. 176

• astronomy
• navigation
• surveying
• medicine
• electronics
• wave motion

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What is a function?

• A function is a relation (set of ordered pairs)
  in which...

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• for each value of the independent variable
  (input) there is one and only one value of the
  dependent variable (output).

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• Informally, a function is a rule, or set of
  instructions, for assigning a unique output to
  any acceptable input.

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Domain

• all the possible values for the independent
  variable, or all the acceptable input, for x.

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Range

• all the possible values for the dependent
  variable, or all the acceptable output, or y.