Double angle formulae without a calculator
Channel: Paul King
Date: 2016-10-23

Trig problems without a calculator can be done for certain problems, and it is shown here how to handle them for double angles. If you have trouble with fractions, you are advised to pause the video on steps you have trouble with and work them out yourself before moving on. 

The following playlists contain videos I made, and also very pertinent videos from other sources for educational purposes.

Grade 10 Math Playlist: http://bit.ly/1Sj8qOB
Grade 12 Advanced Functions Playlist: http://bit.ly/1OoXhWH
Grade 12 Calculus and Vectors Playlist: http://bit.ly/1Sj8qOB
Grade 12 Data Management (discrete math and stats) Playlist: http://bit.ly/1NSCH1q
Recreational Math Playlist: http://bit.ly/1ZxoBtI

Chemistry Playlist: http://bit.ly/1QSc82x

This video was shot using a Samsung camera, and closeups and panning done in post-production under Adobe Premiere Elements 11. Audio was from Audacity (open source), using a Logitech G330 gaming headset. Slides involving steps used MS PowerPoint as the software. Static title cards were done in MS Word, and captured using the Snipping Tool under MS Windows.