Please review the trigonometric functions. We need definitions and basic
formulas. A good source for it is
Muldowney's notes
,
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.