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- HSF-TF.C.8Prove the Pythagorean identity sin<sup>2</sup>(θ) + cos<sup>2</sup>(θ) = 1 and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.
- HSF-TF.C.9(+) Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.

Playing with the Numbers

Algebra II

» Unit:

Trigonometric Functions

Big Idea:Students transform equations and graphs of trig functions to earn points and win the game!

Unit Review Game: Lingo

12th Grade Math

» Unit:

Trigonometric Relationships

Big Idea:Today's review game will bring high energy and deep thinking into the classroom.

What do Triangles have to do with Circles?

Algebra II

» Unit:

Trigonometric Functions

Big Idea:How is the unit circle related to "triangle measurement"? A story of two equivalent definitions.

Unit Assessment: Trigonometric Relationships

12th Grade Math

» Unit:

Trigonometric Relationships

Big Idea:Assess your students' understanding of this unit.

Final Exam Review Stations (Day 1 of 3)

12th Grade Math

» Unit:

Review

Big Idea:Students review by working through various stations at their own pace and receive immediate feedback on their work.

Sum and Difference Identities

12th Grade Math

» Unit:

Trigonometric Equations

Big Idea:The love story of Sinbad and Cosette helps students to remember and apply the sum and difference identities.

Proving Identities

12th Grade Math

» Unit:

Trigonometric Identities

Big Idea:How can you use the fundamental identities show 2 expressions are equivalent?

Formative assessment over Identities

12th Grade Math

» Unit:

Trigonometric Identities

Big Idea:Through a quiz students will demonstrate their ability to verify identities.

Pythagorean Identity

Algebra II

» Unit:

Trigonometric Functions

Big Idea:How can you use Pythagorean Theorem in two different ways to solve the same problem? Find out in this lesson.

Weather Ups and Downs

Algebra II

» Unit:

Trigonometric Functions

Big Idea:This lesson is awesome because it gives your students a real world connection to periodicity using weather data. They get to fit a sine and/or cosine graph to actual data!

When Will We Ever Use This

Algebra II

» Unit:

Trigonometric Functions

Big Idea:Want a good answer to “When will we ever use this?” This lesson gives students an opportunity to explore applications of inverse trig functions.

Tangent Modeling

Algebra II

» Unit:

Trigonometric Functions

Big Idea:This lesson is awesome because it gives your students a connection to tangent periodicity using a real-world example. They generate data and create a tangent equation that fits it.

Trigonometric Functions Review Day 1

Algebra II

» Unit:

Trigonometric Functions

Big Idea:This lesson will train students HOW to study mathematics as well as help them review.

Here's Proof

Algebra II

» Unit:

Trigonometric Functions

Big Idea:Pythagoras again!? Make everybody happy – give your students another chance to connect trig functions to something they already understand.

Trig Review

Algebra II

» Unit:

Trigonometric Functions

Big Idea:If you hate reviewing for an exam, maybe this lesson is for you. Let your students take charge of their review and see how much more you all get out of the process!

HSF-TF.C.8

Prove the Pythagorean identity sin^{2}(θ) + cos^{2}(θ) = 1 and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.

HSF-TF.C.9

(+) Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.