In this lesson, Julie Harland demonstrates how to use trig identities to compute the sine and tangent of certain angles. Specifically, she uses the half-angle identity to find the exact value of sine of 157.5 degrees and tangent of 157.5 degrees. She walks through the process step-by-step and provides helpful tips along the way. By the end of the lesson, viewers will have a better understanding of half-angle identities and how to use them in computations.
Using Trig Identities to make computations.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com