## Trigonometry – Cosine Difference Formula

Cosine Difference Formula In this tutorial students learn how to verify a trigonometric equation using trigonometric identities like the difference formula for cosine. Virginia Standards of Learning (SOL) T.5 Key Points of Knowledge Sum and Difference Formulas cos (α + β) = cos (α) cos (β) – sin (α) sin (β) cos (α – β) =… Read More »