In these lessons we will look at Evaluating Trigonometric Functions Using the Reference Angle.
The following figures give examples of the standard angle and the reference angle for the different quadrants. Scroll down the page for more examples and solutions.
What is The Reference Angle Theorem?
The Reference Angle Theorem states that
To find the value of a trigonometric function of any angle t:
How to evaluate trig functions using reference angles?
Evaluating Trigonometric Functions Using Reference Angles
Evaluating Trigonometric Functions Using the Reference Angle, Example 1
A quick review of the unit circle in quadrant 1 and discuss how to use the reference angle to evaluate some trig functions
Evaluating Trigonometric Functions Using the Reference Angle, Example 2
Discuss how to use the reference angle to evaluate some more trig functions.
Evaluating Trig functions using reference angles
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