Math 128 - Plane Trigonometry
Fall 2026

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Announcements:
 -  As discussed in class, Quiz 2 will be given at the beginning of class on Friday, October 2 on trigonometric identities. You will need to know the formulas for all the double-angle identities, all the reduction of powers identities, and the addition and subtraction identities for sin and cos. Additionally, you should still know the reciprocal, quotient, and Pythagorean identities from earlier in the course.





Homework Assignments
 All homework is to be completed online at MyOpenMath.com.  You can find all weekly assignments and due dates there.

Old Announcements:
  - As a reminder, the quiz on trig values of special angles will be given at the beginning of class on Friday, September 4.   It will be on the values of sin, cos, and tan of the angles π/6, π/4, and π/3.  You must know these 9 ratios without a calculator, and you must get all 9 correct to get full credit on the quiz.  If you not get full credit on the quiz, you will get the opportunity to retake the quiz at a later date for half credit.
 - Exam 1 will be given on Friday, September 18.  It will cover material from Chapter 7 and Chapter 8.  You should bring a scientific calculator to use, but no graphing calculators will be permitted, and no notes or books will be permitted.  To help you prepare, I will have extra office hours in the library on Thursday, September 17 from 3:00-4:30pm, so you should feel free to stop by and ask questions to aid your review.