Reflection: Connection to Prior Knowledge Solving Trig Equations - Section 1: Launch and Explore


Sometimes the little things are the most rewarding. While trying to solve 4(sinx)^2 + 8sinx = -3, I saw this student rewrite the equation as 4x^2 + 8x +3 = 0. I was so excited that the student realized that the structure of this equation was basically the same as a simple quadratic! In addition, I was even more excited that this strategy was something we already discussed when we solved log equations. I hope that our earlier work stuck with her and she made that connection. Regardless, it was awesome that she understood that this equation looks a lot more difficult than it actually is and that she can use familiar tools to solve an unfamiliar equation.

  Connection to Prior Knowledge: The Little Things
Loading resource...

Solving Trig Equations

Unit 5: Trigonometric Relationships
Lesson 9 of 15

Objective: SWBAT use factoring and the reciprocal properties to solve trigonometric equations.

Big Idea: Why do these trig equations have so many solutions?

  Print Lesson
Add this lesson to your favorites
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
Investigating Radians
12th Grade Math » Rotations and Cyclical Functions
Big Idea: Students use cylinders and string to investigate radian angle measurements and then use their findings to develop a method to convert from radian to degrees.
Phoenix, AZ
Environment: Urban
Tiffany Dawdy
The Unit Radius and the Unit Hypotenuse
12th Grade Math » Trigonometry: The Unit Circle
Big Idea: The unit circle provides a rich landscape in which students can find surprising patterns as they have the experience of creating real mathematics.
Worcester, MA
Environment: Urban
James Dunseith
Something went wrong. See details for more info
Nothing to upload