Sum and Difference Links

There are several resources to view proofs of the angle addition and angle subtraction identities.  Look them over and make sure you understand them.  You will be required to prove some of the basic identities on your test and the proofs of these identities require diagrams which may not occur to you during a test situation if you haven’t thought about them before.

Demana Precalculus 5.3 page 421 (a distance formula based proof)

Brown Advanced Math 10.1 p.369 (a law of cosines based proof)

Mr. Richardson’s PowerPoint presentation

            download here

Another website with very elegant triangle proofs:

            http://www.cut-the-knot.org/triangle/SinCosFormula.shtml  and

            http://www.cut-the-knot.org/triangle/SinCosFormula2.shtml (beautiful!)

Trig Identities

Lots of Proofs this unit! We start with simplifying practice and then jump in.

Note: We will be using the Demana book for most, but not all, of the assignments.

2/12   Trig Identity basics

          HW D p.410-411/3-60 by 3's, 69-73 odd

2/13   Simplifying for a solution

          HW D p.411-412/52-62, 75-82, 85

2/15   Proving Trig Identities

          CW D p.418/11-33 odd

2/16 - 2/24 February Vacation

2/25   Recap and More Practice with Trig Identities

          HW D p.418-419/35-51 odd, 52-60, 71

2/26   Review all, Sum and Difference Formulas

          HW D p.425-427/3,5,7,13,17,21,27,29,31-35,37,43,45,47,48,52,55,73

2/27   Double Angle, Half Angle and Power Reducing Formulas

          CW B p.374/39-41, p.385/45-47

          HW D p.432/3-30 by 3's, 39-45 odd, 53

3/01   Review and Extension Problems  CW Worksheet

          HW B p.384-385/3, 5, 52, 53 and p.390-391/23, 26-28, 43, 44

3/04  More Practice
3/05  Trig Identities Test

Dealing with the Test/Snow Day

The test will happen on Monday, February 11th due to the snow day.   You may email me this weekend if you have questions.