Reflection: Modeling Problem Solving Identities - Section 2: Problem solving


Here is an example of student work. After reviewing this work, I concluded that this student's understanding is at a high level with respect to the CCSS. When looking his work,  I had to review the first step for a few seconds before I was able to follow his reasoning.

In this case, the student worked to the last shown step. Then, he was confused about finishing the identity. At this stage I provided some assistance. I modeled what I do with identities by having the student look back at where he needed to end. I commented "the final expression has only sine and cosine, so we need to get rid of tangent." At this point, the student realized that tan x =sin x/cos x and he finished the problem on his own.

The student also asked whether there were enough steps in his argument for someone to follow.  We talked about writing out reasons to the right to help others. When I questioned the student he could explain each step. I explained that writing the reasons out would help others follow the process. We also looked at his textbook to see how the authors write out explanations beside the solution. Advanced students need to realize that they may need to write out explanations or show more work so other students can follow their reasoning. This will help those students if they take advanced math classes in college.

  Modeling: Explaining your reasoning using algebra
Loading resource...

Problem Solving Identities

Unit 9: Trigonometric Identities
Lesson 7 of 14

Objective: SWBAT use fundamental identities to verify other identities.

Big Idea: Through the use of algebra and known identities other identities can be verified.

  Print Lesson
1 teacher likes this lesson
Math, Trigonometric identities
  45 minutes
Similar Lessons
What do Triangles have to do with Circles?
Algebra II » Trigonometric Functions
Big Idea: How is the unit circle related to "triangle measurement"? A story of two equivalent definitions.
Fort Collins, CO
Environment: Suburban
Jacob Nazeck
Trigonometric Identities - Day 1 of 2
12th Grade Math » Trigonometric Relationships
Big Idea: Identifying what makes a trig expression complex will keep you focused on what needs to be simplified.
Troy, MI
Environment: Suburban
Tim  Marley
Discovering Trig Identities (Day 4 of 4)
12th Grade Math » Trigonometric Equations
Big Idea: Students use TI-Nspire calculators to develop their own understandings of what trigonometric identities are and why they work.
Phoenix, AZ
Environment: Urban
Tiffany Dawdy
Something went wrong. See details for more info
Nothing to upload