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Trigonometric identities : Law of cosines

By: Sal Khan

Introduction to the law of cosines to solve for a side of a triangle when 2 sides and an angle are known.

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

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Dependent events : Monty Hall Problem

By: Sal Khan

Presentation and analysis of the famous Monty Hall Problem

Basics of probability and combinatorics. What's the probability of picking two e from the bag in scrabble (assuming that I don't replace the tiles). Well, the probability of picking an 'e' on your second try depends on what happened in the first (if you

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Asymptotes and graphing rational functions : Another Rational Func...

By: Sal Khan, CK-12 Foundation

Another Rational Function Graph Example

Exploring quadratics and higher degree polynomials. Also in-depth look at rational functions.

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Parametric equations : Parametric Equations 4

By: Sal Khan

Parametric Equations that move along the same path

An alternative to Cartesian coordinates. Here we will explore representing our x's and y's in terms of a third variable or parameter (often 't'). Not only can we describe new things, but it can be super useful for describing things like particle motion in

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Radians : Radians and degrees

By: Sal Khan

What a radian is. Converting radians to degrees and vice versa.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

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