Philfour Precalculus : Trigonometric Identities - Half Angle Identities (Power Reduction Identities)
Channel: Christian Seberino
Date: 2015-04-13

For free classes and affordable tutorial services, please visit
http://philfour.com.

Sincerely,

Dr. Christian Seberino

Feel free to copy, distribute and modify this video provided you leave the
attribution in place.