lesson
Deriving Double Angle Formulas from Addition Formulas
Derive the double angle formulas for sine, cosine, and tangent by substituting b = a into the addition formulas.

Derive the double angle formulas for sine, cosine, and tangent by substituting b = a into the addition formulas.
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10th Grade · Math · CCSS
11 lessons
Prove and apply the addition and subtraction formulas for sine, cosine, and tangent, and use them to derive and apply the double angle formulas.