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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.

Unit Assessment: Trigonometric Relationships

12th Grade Math

» Unit:

Trigonometric Relationships

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

Does cos(A - B) = cos(A) - cos(B)?

12th Grade Math

» Unit:

Trigonometric Relationships

Big Idea:Students disprove a potential identity and then derive the real cos(A - B) formula.

Sum and Difference Day 1 of 2

12th Grade Math

» Unit:

Trigonometric Identities

Big Idea:After analyzing a proof for the sum of angles sine formula, students work to produce the other sum and difference formulas.

Midterm Review Workshop

12th Grade Math

» Unit:

Midterm Review and Exam

Big Idea:Students work on midterm review and let you know what they still need help with.

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.

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!

Touching Tangents

Algebra II

» Unit:

Trigonometric Functions

Big Idea:This lesson is awesome because students get to explore tangent graphs and asymptotes with and without a graphing calculator

Pluses and Minuses

Algebra II

» Unit:

Trigonometric Functions

Big Idea:Automobiles, photography, music, weights…what do these have in common? Trigonometry, of course!

Double or Half

Algebra II

» Unit:

Trigonometric Functions

Big Idea:Double or nothing? No, double or half – angle formulas that is. Let students practice using these formulas to simplify or solve trig functions.

Which Way Do We Go?

Algebra II

» Unit:

Trigonometric Functions

Big Idea: Which way do we go? Help your students learn strategies for choosing which trig function makes the best model for real-world data.

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.