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# Unit Assessment: Trigonometric Relationships

Lesson 15 of 15

## Objective: SWBAT use trigonometric identities and properties to solve a variety of problems.

*55 minutes*

#### Unit Assessment

*55 min*

Here are some sample problems that you may choose to use for the assessment of this unit:

Trigonometric Relationships Exam Problems

While these problems all may look straightforward, there are many, many layers to each problem as students must keep in mind a lot of the knowledge that we have learned throughout this unit and the previous one.

For question #5, I ask students why the plus or minus symbol is an essential part of the cosine half angle formula. I want them to understand that this formula is derived from the double angle formula and that since there is a squared term, when we take the square root of both sides we get plus or minus. Also, I want students to understand that the sign (plus or minus) of their answer when using the formula depends on the quadrant. For example, if x is 300 degrees and use the half angle formula, we get cosine of 150 degrees. Since 150 degrees is in quadrant II, the cosine value would be negative.

#### 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