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

    Trigonometric functions can be defined and calculated independently of the unit circle, and you can use other methods, including calculators and tables, to determine their values.

  2. Khan Academy | Khan Academy

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  3. Trigonometric functions: FAQ (article) | Khan Academy

    What is the unit circle? The unit circle is a circle with a radius of 1 centered at the origin. We can use the unit circle to help define the trigonometric functions and visualize their values. Learn more with our …

  4. Unit circle (video) | Circular Functions | Khan Academy

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

  5. Standards Mapping - Common Core Math | Khan Academy

    Use the four operations to solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money, including problems involving simple fractions or decimals, and …

  6. 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.

  7. Proof of the Pythagorean trig identity (video) | Khan Academy

    If you have a point (x, y), the distance from the origin to (x, y) is given by √ (x²+y²). The unit circle is the set of points where this distance is 1, where √ (x²+y²)=1. Squaring both sides of the equation, this is …

  8. Free Math Worksheets - Khan Academy Blog

    Mar 15, 2021 · Two-way tables Study design Probability Binomial probability Normal distributions AP®︎/College Statistics Analyzing categorical data Displaying and describing quantitative data …

  9. Trig values of special angles (practice) | Khan Academy

    Find the sine and cosine of special angles, which are angles whose trig values we can determine without the use of a calculator.

  10. Get ready for AP® Calculus | Math | Khan Academy

    Unit 1 Get ready for limits and continuity Unit 2 Get ready for differentiation: definition and basic derivative rules Unit 3 Get ready for differentiation: composite, implicit, and inverse functions Unit 4 …