Sum and Difference Identities and Formulas - Sine, Cosine, Tangent
Explore sum and difference identities and formulas for sine, cosine, and tangent in this comprehensive 50-minute trigonometry tutorial. Learn how to evaluate exact values for angles not found on the unit circle using these formulas. Begin with an introduction to sum and difference formulas, then practice finding the sum of 105 degrees. Examine various formulas before tackling problems like finding a sum or difference equal to 5π/12 on the unit circle. Verify identities, understand ratios of triangle sides, and evaluate trigonometric values. Practice verifying results using sum and difference formulas, writing algebraic expressions, and solving equations in the interval [0, 2π]. Follow along with time-stamped sections for easy navigation through this in-depth trigonometry lesson.