Mathematics 1B
1. session
Tuesday 8. September 2009
Auditorium M1.80
Program
 09:0010:20
 Introduction to the course. Lecture on Edwards and Penny (E&P)
Appendix C, Review of Trigonometry,
page A13 to A17.
 10:2010:45
 Introduction to the exercises.
 10:4512:30
 Group work on text and exercises.
Exercises for 1. session and 2. session
 E&P Appendix C, page A17A18
 Problems no. 1, 3, 7, 9, 11, 15, 17, 21, 26, 29, 37 (don't
use the addition formula in part (c))
 Prove the following formula:
 sin(α)sin(β) =
½ (cos(α–β)–cos(α+β))
 Hint: Start with the right hand side of the equation. Use the addition
formula for cosine.
 E&P Appendix C, page A17A18
 Problems no. 39, 41, 42, 43.

Formulas
Trigonometric identities involving
sine and cosine.
Exact values for sine and cosine of various angles.
Illustrations
Sine and cosine by David Metz
Rotating Phasors by Cory Sharp
Latest update 7. September 2009 by Iver Ottosen