3. A. Calculate the value of each to 4 decimal places: i)sin 43sin 137sin 223sin 317. ii) cos 25cos 155cos 205cos 335. iii)tan 71tan 109 tan 251tan 289 Similarities? Differences? Why?

4. C.A.S.T. Rule The CAST rule defines the quadrants where each trig function is POSITIVE.

5. Therefore: A ll trig ratios are positive in Quadrant I The S ine ratio is the only ratio positive in Quad. II The T angent ratio is the only ratio positive in Quad. III The C osine ratio is the only ratio positive in Quad. IV Examples: Write the expression relating each function to its reference angle. i)sin 310cos 290 tan 125sin 150

6. State the exact value of each of the following; a) sin 300 b) cos 150 c) d) e)

8. Note: A restriction on a Trig equation limits the values of the solution set as the solutions must fall within the limits posed by the restriction. Examples: 1. Solve for to the nearest degree, a)b)c)

9. 2. Solve for to the nearest degree. a) b)

10. c) d)

11. Pg. 454 #12,13ac,14ace,16acd, 19bcdf,MC 1,2 Pg. 437 #15,16,MC 1,2