1. Odds and Even functions Evaluating trig functions Use a calculator to evaluate trig functions

2. Odds and Even Functions  Odd Functions sin (-  ) = -sin  tan (-  ) = -tan  csc (-  ) = -csc  cot(-  ) = -cot  Even Functions cos (-  ) = cos  sec (-  ) = sec 

3. Example  If sin (-  ) = 3/5 Find sin (  ) csc (  ) If cos (  ) = -3/4 Find cos (-  ) sec (-  ) If cos (  ) = 4/5 Find cos (  -  ) cos (  +  )

4. The Six Trigonometric Functions Hypotenuse Adjacent Opposite A B

5. The Six Trigonometric Functions Hypotenuse Adjacent Opposite A B

6. 6 Trigonometric Functions sin  = oppcos  = adjtan  = opp hyp hyp adj AKA S OH C AH T OA csc  = hypsec  = hypcot  = adj opp adj opp And their reciprocals!!!

7. Example Find the values of the six trigonometric functions of . 13 5 

8. Example Find the values of the six trigonometric functions of . 4  4

9. Example Find the values of the six trigonometric functions of . cos  = 5/7

10. Example Find the values of the six trigonometric functions of . cot  = 5

11. Example Find the values of the six trigonometric functions of . sec  = 6

12. Example Find the values of the six trigonometric functions of . csc  =17/4

13. Homework  PAGE103 (31, 33, 35)  Page 113 (1-21 odd)