1. Unit 4: Trigonometry Minds On

2. Unit 4: Trigonometry Minds On AngleSinCosTan

3. Learning Goals: I can use the CAST rule to determine if a Trig Ratio is positive or negative. I can determine the value of the Reciprocal Trig Ratios using what I know about the Primary Trig Ratio. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule

4. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule The CAST Rule helps us to determine if a trig ratio will be positive or negative. C AS T

5. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule Determine if the following are positive or negative. Do not evaluate. a) Sin (310º) b) Cos (17º) c) Tan (201º)

6. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule What is a reciprocal?

7. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule Primary Trig Ratios Reciprocal Trig Ratios

8. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule Since most calculators don’t have Csc, Sec, and Cot, buttons, we can calculate them using the primary trig ratios.

9. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule If θ = 30º, determine the value of Csc θ.

10. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule If θ = 45º, determine the value of Sec θ.

11. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule

12. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule

13. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule

14. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule

15. Unit 4: Trigonometry Lesson 3 – Reciprocal Trig Ratios and CAST Rule Homework  Pg. 246 #5-7, #10-12