Based on Pearson's Trigonometry 12e by Lial, Hornsby, Schneider and Daniels.
Chapter 5 – Trigonometric Identities
Section 4 – More Identities
Video 11 – Using Half-Angle Identities - Part 1
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Trigonometry Video 5.4.11 - Using Half-Angle Identities - Part 1 | NatokHD