Learn how to verify trigonometric identities involving the addition and subtraction of terms. To do this it is usually useful to convert the addition or subtraction terms in terms of one trigonometric ...

Computing and data shape nearly every aspect of modern life. In recent years, efforts to expand data and computing education in K-12 settings have grown rapidly but unevenly. A new National Academies ...

I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those experiences to help students improve in math through practical applications and tips.