Trigonometric equations and identities (Khan Academy)

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Learn how to solve trigonometric equations and how to use trigonometric identities to solve various problems. (1) Trig identity reference Trig identity reference (2) The inverse trigonometric functions Intro to arcsine Intro to arctangent Intro to arccosine Evaluate inverse trig functions Restricting domains of functions to make them invertible Domain & range of inverse tangent […]

Graphs of trigonometric functions (Khan Academy)

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Learn how to graph trigonometric functions and how to interpret those graphs. Learn how to construct trigonometric functions from their graphs or other features. (1) The graphs of sine, cosine, and tangent Graph of y=sin(x) Graph of y=tan(x) Intersection points of y=sin(x) and y=cos(x) (2) Introduction to amplitude, midline, and extrema of sinusoidal functions Features […]

The unit circle definition of sine, cosine, and tangent (Khan Academy)

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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. (1) Introduction to radians Intro to radians Radians & degrees Degrees to radians Radians to degrees Radians & degrees Radian angles & quadrants (2) The unit circle definition of […]

Trigonometry with general triangles (Khan Academy)

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Learn how to use trigonometry in order to find missing sides and angles in any triangle. (1) The law of sines Solving for a side with the law of sines Solving for an angle with the law of sines Solve triangles using the law of sines Proof of the law of sines (2) The law […]

Trigonometry with right triangles (Khan Academy)

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Learn the basics of trigonometry: What are sine, cosine, and tangent? How can we use them to solve for unknown sides and angles in right triangles? (1) Introduction to the trigonometric ratios Sides of right triangles Intro to the trigonometric ratios Trigonometric ratios in right triangles Trigonometric ratios in right triangles Trigonometric ratios in right […]

Khan Academy

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Khan Academy is perhaps the best known free collection of online courses. The subjects span a great range of topics, including everything from math and science to art history. According to their about page: Our mission is to provide a free, world‑class education for anyone, anywhere. A full list of the subjects they offer is […]

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