Deriving the Half Angle Formulas

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This video tutorial explains how to derive the half-angle formulas for sine, cosine, and tangent using the reduction formulas. The process involves replacing the angle theta with alpha/2 and solving for the trig function.

Half-angle formulas are useful for determining the trig functions of angles that are half of the known angles (ex. 22.5 and 15 degrees).
  1. Code on the Rocks
  2. half angle identity
  3. trig identities
  4. half-angle formula
  5. half angle rules
  6. half angle equations
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