Here's the revised YouTube video description without the links: Learn how to use the double angle identities to solve ...

Practise solving trigonometric equations in degrees or radians using CAST and its period to find other solutions within the range, including multiple or compound angles and the wave function.

Sure, here is the revised description with all the links and additional text removed: Learn how to use the double angle identities to solve trigonometric equations. When we have equations with a ...