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Why is tangent called "tangent" in trigonometry?

And why is secant called "secant" and cosine called co - sine? Why these names?

In this video I explain the connection between the tangent of an angle and a tangent line. Ditto for the secant of an angle and a secant line. BTW: Did you know that "sine" means "harbour" or "cove"?

Defining i to be the square root of negative one is simply wrong! This brief video explains why

A standard unit in an algebra II or pre-calculus course is to find a exponential function that fits two data points. There is a hard way to do this, and there is an easy way - just write down the answer! I show you how.

In 1834 Dirichlet outined a very simple but extraordinarily powerful principle. I briefly discuss it here, and then quickly move on to use it to solve a curious little puzzle: Is there a power of three that ends with 001?

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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