1. Reciprocal Trig Functions Section 13.8

2. The Reciprocal Functions  cosecant (csc θ)=  secant (sec θ)=  cotangent (cot θ)=

3. Finding Trig Values by Using the Graphing Calculators Procedure: 1) make sure that you are in the right calculator mode (either radian or degree) 2) enter everything into the calculator and hit ENTER ** if the function is a reciprocal one, you must enter it as a reciprocal

4. Let’s try some… Find the following trig values: 1) sin 40° 2) cos 115° 3) csc 78° 4) cot 212°

5. Let’s try some…

6. Let’s try these…

7. Let’s look at the graphs of the reciprocal functions…

8. Let’s find these values by using the graph… sec 20° csc 89° cot 134°

9. Procedure… 1) type in and graph function (either ) 2) convert degrees into radians (either pi or decimal) 3) press TRACE, type in the radian measurement, and press ENTER (the trig value is the y-value)