# Trigonometry

## Inverse trigonometric functions

Learn
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!

## Sinusoidal equations

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

## Sinusoidal models

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

## Trigonometric identities

Learn
Sine & cosine identities: symmetryTangent identities: symmetrySine & cosine identities: periodicityTangent identities: periodicity

Learn
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

Learn
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!