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# Trigonometric equations and identities

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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

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

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Solving sinusoidal equations of the form sin(x)=dSolving cos(θ)=1 and cos(θ)=-1

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

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Solve sinusoidal equationsGet 3 of 4 questions to level up!

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Trig word problem: solving for temperatureTrigonometric equations review

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Sinusoidal models word problemsGet 3 of 4 questions to level up!

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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

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

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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

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

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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