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.

Bearing Problems and Navigation:
https://www.youtube.com/watch?v=cSKAqfGXOPI

Two Triangle Problems - More Examples:
https://www.youtube.com/watch?v=QM1T6eL8t48

Verifying Trigonometric Identities:
https://www.youtube.com/watch?v=Rf05H8ogHLg

Double Angle Identities:
https://www.youtube.com/watch?v=SE5SBTgrwH8

Verifying Trig Identities With Double Angles:
https://www.youtube.com/watch?v=Wh7hM_FsN3Y

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Half Angle Formulas:
https://www.youtube.com/watch?v=9YI69okba3c

Verifying Trig Identities Using Half Angles:
https://www.youtube.com/watch?v=qWJ4HwJ_5LY

Inverse Trig Functions With Double Angles:
https://www.youtube.com/watch?v=waDbbpib9cM

Right Triangle Trig With Half Angle Identities:
https://www.youtube.com/watch?v=vEU25NlpaXA

Product To Sum + Sum to Product Formulas:
https://www.youtube.com/watch?v=8Prc7VGt40w

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Solving Trig Equations - Finding All Solutions:
https://www.youtube.com/watch?v=kEcbxiLeGTc

Solving Trig Equations With Multiple Angles:
https://www.youtube.com/watch?v=eZPEW2hVUd0

Solving Trig Equations With Double Angles:
https://www.youtube.com/watch?v=-R7394Dn854

Trigonometry Final Exam Review:
https://www.youtube.com/watch?v=OAsbx4TEnL0

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathScienceTutor/collections