Double Angle Identities & Formulas of Sin, Cos & Tan - Trigonometry

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This trigonometry video tutorial provides a basic introduction to the double angle identities of sine, cosine, and tangent. It explains how to derive the double angle formulas from the sum and difference identities of sin, cos, and tan and how to use the double angle formulas to find the exact value of trigonometric expressions using right triangle trigonometry and SOHCAHTOA. This video contains many examples and practice problems for you to learn this material.

Bearing Problems and Navigation:


Two Triangle Problems - More Examples:


Verifying Trigonometric Identities:


Sum and Difference Identities:


Verifying Trig Identities With Double Angles:


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Power Reducing Formulas:


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:


Trigonometry Formula Sheet: