1. 5-2 Reciprocal Ratios

2. Remember:
Sine
Cosine:
Tangent:

3. Basic Trig Review

4. Reciprocal Trigonometric Ratios
There are actually 3 more trig ratios other than sine, cosine, and tangent. They are:

5. Practice: If cos(x) = ¾, find sec(x) 2) If cscθ= 1.345, find sinθ
3) If tanθ = .8, find cotθ

6. 4) Find the values of all 6 trigonometric ratios from <P
(leave in radical form…no decimals!)
Sin = Cos = Tan=
Csc = sec = cot =

7. Using Special Right Triangles
Remember from Geometry….

8. Examples 5) Solve for the missing sides.

9. Examples 7) Solve for the missing sides.

10. Using Special Right Triangles
Use the figures to write the trig ratios for an 30°
Sin 30 = csc30 =
Cos30= sec 30=
Tan 30= cot 30=

11. θ
Sin
Cos
Tan
Csc
Sec
Cot 30 45 60
This chart is important! You need to either memorize the values, or know how to create it from scratch!

12. Cofunctions Cofunctions: Two trig functions that have the same ratio.
Ex) Sin 30 = ½, and Cos 60= ½
Using the chart, name 2 other cofunctions:
What is the relationship between the angles?

13. Assignment:
P. 288 (14-22) (25)