About This Lesson
http://www.freemathvideos.com In this video series I will show you how to apply the half angle formula for sine, cosine and tangent. We will not discuss the proofs for these but practice on applying the formula's when given certain amount of information. In is important to understand when applying the half angle formula that we use the actual angle for sine and cosine as well as use the the positive or negative value depending on where the angle lies. For using tangent we will brush up on our algebra skills to write are answer in simplest terms
