Please review the trigonometric functions. We need definitions and basic 
formulas. A good source for it is 
<A HREF="http://www.math.ualberta.ca/honors/files/math118.pdf">
Muldowney's notes
</A>,
which are  
available at the Math Department (main office, CAB 632) and online. 



I assume the knowledge of 
pages 169-177 (till formula 18) of it. Please do also Problems 7.25 -- 7.29, 
7.30 (a, b), 7.33 on page 187.