# Trigonometric equations and identities

## The inverse trigonometric functions

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Intro to arcsineIntro to arctangentIntro to arccosineRestricting domains of functions to make them invertibleDomain & range of inverse tangent functionUsing inverse trig functions with a calculatorInverse trigonometric functions review
Practice
Evaluate inverse trig functionsGet 3 of 4 questions to level up!

## Solving basic sinusoidal equations

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Solving sinusoidal equations of the form sin(x)=dSolving cos(θ)=1 and cos(θ)=-1
Practice
Solve sinusoidal equations (basic)Get 3 of 4 questions to level up!

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Practice
Solve sinusoidal equationsGet 3 of 4 questions to level up!

## Solving sinusoidal models

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Trig word problem: solving for temperatureTrigonometric equations review
Practice
Sinusoidal models word problemsGet 3 of 4 questions to level up!

## Introduction to the trigonometric angle addition identities

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Review of trig angle addition identitiesUsing the cosine angle addition identityUsing the cosine double-angle identityProof of the sine angle addition identityProof of the cosine angle addition identity
Practice
Using the trig angle addition identitiesGet 3 of 4 questions to level up!

## Using trigonometric identities to solve problems

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Finding trig values using angle addition identitiesUsing trig angle addition identities: finding side lengthsUsing trig angle addition identities: manipulating expressionsUsing trigonometric identitiesTrig identity reference
Practice
Find trig values using angle addition identitiesGet 3 of 4 questions to level up!

## Challenging trigonometry problems

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Trig challenge problem: area of a triangleTrig challenge problem: area of a hexagonTrig challenge problem: cosine of angle-sumTrig challenge problem: arithmetic progressionTrig challenge problem: maximum valueTrig challenge problem: multiple constraintsTrig challenge problem: system of equations