Dave's Web Corner

MTH-121 Home

• MTH-121-WN810 and MTH-121-WN820 are online courses with no scheduled class sessions.
• Office Hours
  • in person
    • Delta College Main Campus, G202
      • Wednesday, 12:00pm-12:55pm
    • Delta Downtown Midland Center, Room 208
      • Wednesday, 5:00pm-5:55pm
  • online
    • Zoom office hours, enter
      • Tuesday, 6:00pm-6:55pm
      • Wednesday, 1:00pm-1:55pm
      • Thursday, 9:00am-9:55am
  • by appointment
    • contact me and we will find a mutually convenient time to meet
• Assessments
  • All course assessments: homework, quizzes, and exams are completed at https://www.xyzhomework.com
• Calendar
  • Calendar of all assessment deadlines (homework, quizzes, exams)
• Formulas
  • Fundamental Trigonometry Identities, a formula sheet that outlines everything we will use in this course
• XYZ Homework System
  • Welcome_to_Plane_Trigonometry.pdf, instructions for purchasing access and creating an account for our homework system

Week 12 in Plane Trigonometry

• Remember that you have three assessments this week, all completed at https://www.xyzhomework.com. This is a busy week.
  • Quiz 6 due by 11:59pm, Tuesday, March 25: Chapter 6
  • Exam 3 due by 11:59pm, Thursday, March 27: Chapters 5, 6
  • Homework 11 due by 11:59pm, Saturday, November 9: Sections 7.4, B.1, B.2

• We close Chapter 7 revisiting the calculation of the area of a triangle, including an under-appreciated formula: Heron's formula.
• Before we begin our final chapter, Chapter 8, we will take a deeper look at vectors and the calculations that we can do with vectors, in both two and three dimensions.
  • addition, subtraction, scalar multiplication, magnitude, dot product, angle, projection, and direction cosines
  • both the dot product and the cross product have an algebraic definition and a geometric interpretation
  • cross products calculate areas of triangles and parallelograms in a natural way and the scalar triple product calculates the volume of parallelepipeds
• Remember that never too far away from vector calculations is the idea that vectors are characterized by right triangles.
• Always try to draw a diagram of the problem you are working on, even if one is already given to you, or if you can only draw a rough representation. Drawing a diagram can help you make sure that your answers are reasonable.

Plane Trigonometry

• Week 1 (January 5-11)
  • Course Introduction
  • 1.1 Angles, Degrees, and Special Triangles
  • 1.2 The Rectangular Coordinate System
  • 1.3 Definition I: Trigonometric Functions
  • Homework 1, due by 11:59pm, Saturday, January 11
• Week 2 (January 12-18)
  • 1.4 Introduction to Identities
  • 1.5 More on Identities
  • 2.1 Definition II: Right Triangle Trigonometry
  • 2.2 Calculators and Trigonometric Functions of an Acute Angle
  • Homework 2, due by 11:59pm, Saturday, January 18
• Week 3 (January 19-25)
  • (Delta College Martin Luther King, Jr. Day, Monday, January 20)
  • 2.3 Solving Right Triangles
  • 2.4 Applications
  • 2.5 Vectors: A Geometric Approach
  • Quiz 1, due by 11:59pm, Tuesday, January 21
  • Homework 3, due by 11:59pm, Saturday, January 25
• Week 4 (January 26-February 1)
  • 3.1 Reference Angle
  • 3.2 Radians and Degrees
  • 3.3 Definition III: Circular Functions
  • 3.4 Length of an Arc and Area of a Sector
  • Quiz 2, due by 11:59pm, Tuesday, January 28
  • Exam 1, due by 11:59pm, Thursday, January 30
  • Homework 4, due by 11:59pm, Saturday, February 1
• Week 5 (February 2-8)
  • 3.5 Velocities
  • 4.1 Basic Graphs
  • 4.2 Amplitude and Period
  • Homework 5, due by 11:59pm, Saturday, February 8
• Week 6 (February 9-15)
  • 4.3 Phase Shift
  • A.1 Amplitude and Period (Reciprocal Functions)
  • A.2 Phase Shift (Reciprocal Functions)
  • 4.4 Finding the Equation from the Graph
  • Quiz 3, due by 11:59pm, Tuesday, February 11
  • Homework 6, due by 11:59pm, Saturday, February 15
• Week 7 (February 16-22)
  • 4.5 Graphing Combinations of Functions
  • 4.6 Inverse Trigonometric Functions
  • 5.1 Proving Identities
  • Quiz A, due by 11:59pm, February 18
  • Homework 7, due by 11:59pm, Saturday, February 22
• Week 8 (February 23-March 1)
  • 5.2 Sum and Difference Formulas
  • 5.3 Double-Angle Formulas
  • 5.4 Half-Angle Formulas
  • 5.5 Additional Identities
  • Quiz 4, due by 11:59pm, Tuesday, February 25
  • Exam 2, due by 11:59pm, Thursday, February 27
  • Homework 8, due by 11:59pm, Saturday, March 1
• Week 9 (March 2-8)
  • Spring Break
• Week 10 (March 9-15)
  • 6.1 Solving Trigonometric Equations
  • 6.2 More on Trigonometric Equations
  • 6.3 Trigonometric Equations Involving Multiple Angles
  • Quiz 5, due by 11:59pm, Tuesday, March 11
  • Homework 9, due by 11:59pm, Saturday, March 15
• Week 11 (March 16-22)
  • 6.4 Parametric Equations and Further Graphing
  • 7.1 The Law of Sines
  • 7.2 The Ambiguous Case
  • 7.3 The Law of Cosines
  • Homework 10, due by 11:59pm, Saturday, March 22
• Week 12 (March 23-29)
  • 7.4 The Area of a Triangle
  • B.1 Vectors
  • B.2 Dot Product of Vectors
  • Quiz 6, due by 11:59pm, Tuesday, March 25
  • Exam 3, due by 11:59pm, Thursday, March 27
  • Homework 11, due by 11:59pm, Saturday, March 29
• Week 13 (March 30-April 5)
  • B.3 Vectors in Space
  • B.4 Cross Products of Vectors
  • 8.1 Complex Numbers
  • 8.2 Trigonometric Form for Complex Numbers
  • Quiz 7, due by 11:59pm, Tuesday, April 1
  • Homework 12, due by 11:59pm, Saturday, April 5
• Week 14 (April 6-12)
  • 8.3 Products and Quotients in Trigonometric Form
  • 8.4 Roots of a Complex Number
  • 8.5 Polar Coordinates
  • Quiz B, due by 11:59pm, Tuesday, April 8
  • Homework 13, due by 11:59pm, Saturday, April 12
• Week 15 (April 13-19)
  • 8.6 Equations in Polar Coordinates and Their Graphs
  • Review
  • Homework 14, due by 11:59pm, Saturday, April 19
• Week 16 (April 20-26)
  • Review
  • Quiz 8, due by 11:59pm, Tuesday, April 22
  • Exam 4, due by 11:59pm, Thursday, April 24
  • Final Exam, due by 11:59pm, Saturday, April 26