This trig video explains how to evaluate trigonometric expressions using right triangle trigonometry, SOHCAHTOA and half angle identities & formulas. This tutorial contains a few example problems. 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 Sum and Difference Identities: https://www.youtube.com/watch?v=gEhxBFQCYic Double Angle Identities: https://www.youtube.com/watch?v=SE5SBTgrwH8 Verifying Trig Identities With Double Angles: https://www.youtube.com/watch?v=Wh7hM_FsN3Y __________________________ Power Reducing Formulas: https://www.youtube.com/watch?v=U6yjjaK8aCc 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 Product To Sum + Sum to Product Formulas: https://www.youtube.com/watch?v=8Prc7VGt40w ______________________________ 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