In this video I show you how to simplify trigonometric identities by adding fractions. I begin this lesson by reminding you ...

Learn how to add or subtract radicals. A radical is a number or an expression under the root symbol. Radicals can only be ...

Over the three years Jordan Ellenberg was writing his book, he repeatedly encountered the same reaction to its subject. “I’d be at a party, and I’d tell someone what my book was about, and then I’d be ...