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  1. Intro to inverse trig functions (article) | Khan Academy

    Learn about arcsine, arccosine, and arctangent, and how they can be used to solve for a missing angle in right triangles.

  2. Derivative of inverse cosine (video) | Khan Academy

    Unraveling the mystery of the inverse cosine function, we find its derivative equals -1/(sqrt(1 - x^2)). This step-by-step proof guides us to a fascinating comparison with the derivative of inverse sine, …

  3. Trigonometry | Precalculus | Math | Khan Academy

    Knowing trig identities is one thing, but being able to prove them takes us to another level. In this unit, we'll prove various trigonometric identities and define inverse trigonometric functions, which allow us …

  4. Intro to arccosine (video) | Trigonometry | Khan Academy

    The inverse of this domain restricted function is the arccosine function. thus for any x in this part of the domain, arccos (cos (x))=x--arccos will return your x back to you from its cosine value. If the original …

  5. Law of cosines: solving for an angle - Khan Academy

    Inverse cosine is the same as arc cosine, but arc cosine is usually used in computer code or calculator notation.

  6. Trigonometry | Khan Academy

    Explore the world of trigonometry by mastering right triangles and their applications, understanding and graphing trig functions, solving problems involving non-right triangles, and unlocking the power of …

  7. Evaluate inverse trig functions (practice) | Khan Academy

    Given a sine, cosine, or tangent value, find the principle angle who has this value. In other words, find the arcsine, arccosine, or arctangent of that value.

  8. Trigonometric functions | Algebra (all content) - 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 functions - …

  9. Restricting domains of functions to make them invertible

    Sal is given the graph of a trigonometric function, and he discusses ways in which he can change the function to make it invertible.

  10. Reciprocal trig ratios (article) | Khan Academy

    Learn how cosecant, secant, and cotangent are the reciprocals of the basic trig ratios: sine, cosine, and tangent.