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4.2

4.2. Trigonometric Functions of Acute Angles. Standard Position. An acute angle θ in standard position , with one ray along the positive x -axis and the other extending into the first quadrant. Trigonometric Functions. Example Evaluating Trigonometric Functions of 45 º.

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4.2

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  1. 4.2 Trigonometric Functions of Acute Angles

  2. Standard Position An acute angle θ in standard position, with one ray along the positive x-axis and the other extending into the first quadrant.

  3. Trigonometric Functions

  4. Example Evaluating Trigonometric Functions of 45º Find the values of all six trigonometric functions for an angle of 45º.

  5. Example Evaluating Trigonometric Functions of 45º Find the values of all six trigonometric functions for an angle of 45º.

  6. Example Evaluating Trigonometric Functions of 60º Find the values of all six trigonometric functions for an angle of 60º.

  7. Example Evaluating Trigonometric Functions of 60º Find the values of all six trigonometric functions for an angle of 60º.

  8. Common Calculator Errors When Evaluating Trig Functions • Using the calculator in the wrong angle mode (degree/radians) • Using the inverse trig keys to evaluate cot, sec, and csc • Using function shorthand that the calculator does not recognize • Not closing parentheses

  9. Example Solving a Right Triangle

  10. Example Solving a Right Triangle

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