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# Unit 4: Trigonometric equations and identities

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## About this unit

In this unit, you'll explore the power and beauty of trigonometric equations and identities, which allow you to express and relate different aspects of triangles, circles, and waves. You'll learn how to use trigonometric functions, their inverses, and various identities to solve and check equations and inequalities, and to model and analyze problems involving periodic motion, sound, light, and more.

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### Practice

- Evaluate inverse trig functionsGet 3 of 4 questions to level up!

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### Practice

- Solve sinusoidal equations (basic)Get 3 of 4 questions to level up!
- Solve sinusoidal equationsGet 3 of 4 questions to level up!

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### Practice

- Interpret solutions of trigonometric equations in contextGet 3 of 4 questions to level up!
- Sinusoidal models word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

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### Practice

- Using the trig angle addition identitiesGet 3 of 4 questions to level up!

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### Practice

- Find trig values using angle addition identitiesGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

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Level up on all the skills in this unit and collect up to 700 Mastery points!