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# Formative Assessment: Solving Trig Equations

Lesson 13 of 15

## Objective: SWBAT solve trigonometric equations.

*55 minutes*

#### Partner Quiz

*30 min*

For this quiz, I will randomly assign students with a partner and have them work together. I don't use** partner quizzes** all of the time, but when I do I am always impressed by how my students work together. Since there is a tangible incentive (a good grade), they are always very eager to discuss and defend their answers. Some of the best conversations will occur during this time. I discuss more about partner quizzes in this video.

I explain to students that they should both be doing the work and that they will staple their quizzes together when they turn them in. I will randomly select one quiz to grade and each student will get the same grade. This prevents one student from doing all of the work and both are held accountable.

In this document are some **sample questions** that you may choose to use on your quiz. I try to give a variety of problems so that each type of equation solving (squaring both sides, using an identity, etc.) is featured.

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#### Exam Review

*25 min*

Here is a review to get students ready for the upcoming exam. This is traditionally a challenging unit for my students so I stress to them to put forth a good effort on this review and to make notes of problems or concepts that are still challenging for them. I discuss more about this in the video below.

#### Resources

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- UNIT 1: Functioning with Functions
- UNIT 2: Polynomial and Rational Functions
- UNIT 3: Exponential and Logarithmic Functions
- UNIT 4: Trigonometric Functions
- UNIT 5: Trigonometric Relationships
- UNIT 6: Additional Trigonometry Topics
- UNIT 7: Midterm Review and Exam
- UNIT 8: Matrices and Systems
- UNIT 9: Sequences and Series
- UNIT 10: Conic Sections
- UNIT 11: Parametric Equations and Polar Coordinates
- UNIT 12: Math in 3D
- UNIT 13: Limits and Derivatives

- LESSON 1: Trigonometric Identities - Day 1 of 2
- LESSON 2: Trigonometric Identities - Day 2 of 2
- LESSON 3: Student Work Day and Individual Conferences
- LESSON 4: Does cos(A - B) = cos(A) - cos(B)?
- LESSON 5: If sin(A) = 3/5, what is sin(2A)?
- LESSON 6: Formative Assessment Review
- LESSON 7: Formative Assessment: Simplifying Identities and Trig Formulas
- LESSON 8: What is cos(22.5°)?
- LESSON 9: Solving Trig Equations
- LESSON 10: Using Formulas to Solve Trig Equations
- LESSON 11: Extraneous Solutions
- LESSON 12: Putting All of the Pieces Together
- LESSON 13: Formative Assessment: Solving Trig Equations
- LESSON 14: Unit Review Game: Lingo
- LESSON 15: Unit Assessment: Trigonometric Relationships