lesson
The Subtraction Formula for Cosine: cos(a − b)
State and apply the formula cos(a − b) = cos(a)cos(b) + sin(a)sin(b) to evaluate trig expressions.
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Addition, Subtraction, and Double Angle Formulas
11 lessons
Goal
Prove and apply the addition and subtraction formulas for sine, cosine, and tangent, and use them to derive and apply the double angle formulas.
11 lessons
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- The Addition Formula for Sine: sin(a + b)Up next
- The Addition Formula for Cosine: cos(a + b)Not started yet
- The Addition Formula for Tangent: tan(a + b)Not started yet
- The Subtraction Formula for Sine: sin(a − b)Not started yet
- The Subtraction Formula for Cosine: cos(a − b)You are here
- The Subtraction Formula for Tangent: tan(a − b)Not started yet
- Proving the Addition and Subtraction FormulasNot started yet
- Using Addition Formulas to Evaluate Trigonometric ExpressionsNot started yet
- Using Subtraction Formulas to Evaluate Trigonometric ExpressionsNot started yet
- Deriving Double Angle Formulas from Addition FormulasNot started yet
- Trigonometric Identities and Formulas: Mixed PracticeNot started yet
