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The unit circle definition of sine, cosine, and tangent

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Intro to radiansRadians & degreesDegrees to radiansRadians to degreesRadian angles & quadrants
Practice
Radians & degreesGet 3 of 4 questions to level up!
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Unit circleThe trig functions & right triangle trig ratiosTrig unit circle review
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Graph of y=sin(x)Graph of y=tan(x)Intersection points of y=sin(x) and y=cos(x)
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Sine & cosine identities: symmetryTangent identities: symmetrySine & cosine identities: periodicityTangent identities: periodicity
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Trig values of special angles
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Trig values of special anglesGet 3 of 4 questions to level up!
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Proof of the Pythagorean trig identityUsing the Pythagorean trig identityPythagorean identity review
Practice
Use the Pythagorean identityGet 3 of 4 questions to level up!
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Tau versus piPi is (still) wrong

About this unit

Learn how the trigonometric ratios are extended to all real numbers using algebra. Start solving simple problems that involve this new definition of the trigonometric functions.