Sum and Difference Identities & Formulas - Sine, Cosine, Tangent - Degrees & Radians, Trigonometry

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This trigonometry video tutorial explains how to use the sum and difference identities / formulas to evaluate sine, cosine, and tangent functions that have angles that are not commonly found in the unit circle. Examples include angles both in degrees and radians.

Trigonometry - Free Formula Sheet:


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Bearing Problems and Navigation:


Two Triangle Problems - More Examples:


Verifying Trigonometric Identities:


Double Angle Identities:


Verifying Trig Identities with Double Angles:


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Half Angle Formulas:


Verifying Trig Identities Using Half Angles:


Inverse Trig Functions with Double Angles:


Right Triangle Trig with Half Angle Identities:


Product To Sum + Sum to Product Formulas:


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Solving Trig Equations - Finding All Solutions:


Solving Trig Equations with Multiple Angles:


Solving Trig Equations with Double Angles:


Trigonometry Final Exam Review:


Final Exams and Video Playlists:


Full-Length Videos and Worksheets: