Understanding Sum and Difference Identities in Trigonometry

Dec 18, 2025

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This guide covers the use of sum and difference identities to find exact values of trigonometric ratios for angles that are not special angles (like 0°, 30°, 45°, etc.). It includes step-by-step instructions on finding values such as cos(15°), cos(75°), and cos(120°) using formulas from your reference sheet. Additionally, it explores finding sin(15°) and provides examples for sin(x-y) and cos(x-y) calculations. Make sure you're comfortable with radian notation and have a unit circle handy.

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Understanding Sum and Difference Identities in Trigonometry

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