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Real Number System   Absolute Value   Functions and Graphs   Trigonometry   Basic Graphing Skills   Studying a Function   Algebraic Skills   Answer Section 
Section 1  Section 2  Section 3   Section 4  Section 5   Section 6  Section 7  Section 8  Section 9  Section 10  Section 11  Section 12   Section 13  Section 14  Section 15  Section 16  Section 17  Section 18   Section 19   Section 20  Section 21  Section 22   Section 23   Answers 
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It is also possible to view whether these two trigonometric expressions are congruent by viewing them graphically and numerically. To do this with equation 12 type
and
.
Then graph the two equations on an appropriate window
like Zoom7. Trigonometric to see the two equations are equivalent
visually. You can also set up a table and look at the yvalues for each
equation for a given x value. Notice the yvalues are always the same.
Check Your Understanding: (Remember to write down the answers to these questions.)
1. Express each degree angle in radians:
a. 270
b. 390
c. 20
2. Express each angle in degrees:
a.
b.
c.
3. Use the identities given above to prove the following identities:
a.
b.
4. View the two identities above both graphically and numerically to see that they are congruent to each other.
Section 16 
This page was last modified on 03/21/16
© Rahn, 2000