# Trigonometric Identities Teacher Resources

Find Trigonometric Identities lesson plans and worksheets
Showing 49 - 72 of 942 resources
9:04
Lesson Planet

#### The unit circle definition of trigonometric function

For Students 10th - 12th
In this video, Sal shows how the sine and cosine of an angle are defined on the unit circle. He inscribes a 30-60-90 triangle in the unit circle and explains how one can use SOH-CAH-TOA to find the coordinates on the circle.
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#### Verifying Trigonometric Identities

For Students 10th - 12th Standards
This quality, short, worksheet provides practice verifying trigonometric identities and completing the included blank unit circle. Learners will also find the exact value of various trigonometric functions given other trigonometric...
4:50
Lesson Planet

#### Limits of Trig Functions: Everything You Need to Know!

For Students 11th - Higher Ed
Discover how to find limits of trigonometric functions. Viewers learn a strategy to calculate limits of trigonometric functions. They see how an expression can be rewritten to one whose limits are already known.
3:16
Lesson Planet

#### Decoding Basic Trigonometric Ratios

For Students 9th - 12th Standards
Demonstrate the calculator keystrokes necessary for finding a measure of an angle using trigonometry. A straight forward lesson explains how to calculate an angle measure given a sine, cosine, or tangent ratio. The narrator discusses...
11:07
Lesson Planet

#### Trigonometry Identity Review/Fun

For Students 10th - 12th
In this video, Sal derives a number of trigonometric identities. Starting with the sum of angles formula for sine and cosine, Sal proves a number of other identities including the double-angle formulas, the difference of angles formulas,...
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#### Exercise Set 5.1: Trigonometric Functions of Real Numbers

For Teachers 10th - 12th
In this trig functions worksheet, students find the trig values of 46 problems.  Students find the trig values of various radian measures.  Students use trig properties to prove trig identities.
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#### Trig Derivatives

For Students 10th - 12th
In this trig derivatives instructional activity, students find the derivative of a given trigonometric function. This one-page instructional activity contains 16 multi-step problems.
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#### Graphing Trig Functions

For Students 9th - 11th
In this graphing trig functions worksheet, students find the amplitude of each function. They graph the function. This four-page worksheet contains 12 problems. Answers are provided on the last two pages.
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#### Review of Trig Ratios

For Students 11th - Higher Ed
In this trigonometric ratios learning exercise, students solve and complete 10 various types of problems. First, they write the degrees listed in radian measure. Then, students find the exact ratios for each equation. They also find the...
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#### Functions, Domains and Composites

For Students 11th - 12th
In this functions, domains and composites worksheet, students solve and complete 23 various types of problems. First, they graph the given trigonometric function on a coordinate plane. Then, students label three points on each graph and...
2 In 2 Collections
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#### Trig Cheat Sheet

For Teachers 10th - 12th Standards
Your pre-calculus learners will make use of this wonderful cheat sheet that summarizes all things trigonometric. Definitions based on both the unit circle and the right triangle are included, as well as many convenient trigonometric...
10:01
Lesson Planet

#### Fun Trig Problem

For Students 11th - Higher Ed
If solving trigonometric equations is your idea of fun, then this video is correctly titled. Here Sal uses trigonometric identities, the quadratic formula, and inverse trigonometric functions to solve a trigonometric equation sent in by...
10:01
Lesson Planet

#### Fun Trig Problem

For Students 10th - 12th
If solving trigonometric equations is your idea of fun, then this video is correctly titled. Here Sal uses trigonometric identities, the quadratic formula, and inverse trigonometric functions to solve a trigonometric equation sent in by...
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#### Similar Parts Investigation

For Teachers 9th - 11th Standards
How tall is that flagpole? Your pupils might want to stand on each other's shoulders to answer this, but this activity is all about using the math knowledge they already possess. Using right triangle trigonometric ratios (SOH CAH TOA)...
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#### How Tall is It?

For Teachers 9th - 11th Standards
Your collaborative geometry learners use trigonometric ratios and a clinometer that they assemble themselves to indirectly measure the height of a flag pole and other objects. Then they create a presentation to explain the process they...
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#### Surveying the Ancient World

For Teachers 9th - 12th Standards
Astrolabes have been used by explorers and astronomers throughout the ages. But how exactly do they work and what can a young mathematician do with one today? Students will build a simple version of this tool and then using the altitude,...
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#### Indirect Measurement Technique: Using Trigonometric Ratios

For Teachers 9th - 12th
Students explore the concept of trigonometric ratios.  In this trigonometric ratios lesson, students use trigonometric ratios and the angle of elevation/depression to determine the height of an object.  Students use their clinometer made...
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#### Section 8-6: Solving Problems Using Trigonometric Ratios

For Students 9th - 12th
In this trigonometric ratios worksheet, students solve 20 short answer and multiple choice problems.  Students use trigonometric ratios, the angle of depression, and angle of elevation to find missing side lengths of angles of a triangle.
8:35
Lesson Planet

#### Trig Identities Part 3 (Part 5 if you watch the proofs)

For Students 10th - 12th
Sal takes the mystery out of the trigonometric identities by showing how easily they can be derived. He continues with a problem he started in the video �Trig identities part three (part five if you watch the proofs) and proves the trig...
16:36
Lesson Planet

#### 2003 AIME ll Problem 11.avi

For Students 10th - 12th
Sal solves an interesting problem from the American Invitational Mathematics Exam from 2003 that uses the Pythagorean Theorem, knowledge of geometric principles of triangles, and the use of trigonometric identities.
18:18
Lesson Planet

#### 2004 AIME ll Problem 14

For Students 10th - 12th
In an involved problem from the American Invitational Mathematics Exam from 2004, Sal logically shows the multi-step solution. He uses geometric properties of hexagons, parallelograms, and triangles, trigonometric identities, and the...
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#### Fundamental Trigonometric Identities: Tangent Identity

For Students 10th - 12th
An identity that thieves can't steal  the tangent identity. Scholars manipulate ratios to investigate the tangent ratio and connect it to the sine and cosine ratios. An interactive that uses color coding helps with this task.
1 In 1 Collection
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#### Right Triangle Trigonometry: Evaluating Trigonometric Ratios

For Students 10th - 12th
For this right triangle trigonometry worksheet, students use trigonometric ratios to determine the length of a missing side of a triangle or to find a specified angle measurement. This four-page worksheet contains 32 problems. Answers...
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#### Evaluating Trig equations and Solving Trig Identities

For Students 9th - Higher Ed
In this trigonometry worksheet, students match trig expressions to their exact value, evaluate trig equations, graph trig equations, and prove trig identities. There are 61 questions.