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

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:
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

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

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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

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/MathSc....ienceTutor/collectio