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  1. Trig unit circle review (article) | Khan Academy

    What is the unit circle definition of the trigonometric functions? The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.

  2. Trigonometric functions | Trigonometry | Math | Khan Academy

    Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving …

  3. Unit circle (video) | Trigonometry | Khan Academy

    Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.

  4. Unit circle (practice) | Trigonometry | Khan Academy

    For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

  5. Unit circle trigonometry | Lesson (article) | Khan Academy

    Unit circle trigonometry | Lesson Angles, arc lengths, and trig functions — Basic example Angles, arc lengths, and trig functions — Harder example Unit circle trigonometry: foundations

  6. Unit circle (with radians) (practice) | Khan Academy

    For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

  7. Trigonometry | Algebra 2 | Math | Khan Academy

    About this unit Let's extend trigonometric ratios sine, cosine, and tangent into functions that are defined for all real numbers. You might be surprised at how we can use the behavior of those …

  8. The trig functions & right triangle trig ratios - Khan Academy

    While the unit circle provides an intuitive geometric interpretation of trigonometric functions, it's not necessary for performing trigonometric calculations. In practice, calculators and …

  9. Unit circle trigonometry: foundations (practice) | Khan Academy

    If x ∘ is equal to 7 π radians, what is the value of x ? (The number of degrees of arc in a circle is 360 . The number of radians of arc in a circle is 2 π .)

  10. Unit 14: Trigonometric functions - Math | Khan Academy

    This topic covers: - Unit circle definition of trig functions - Trig identities - Graphs of sinusoidal & trigonometric functions - Inverse trig functions & solving trig equations - Modeling with trig …