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 ...

Here is the new description with all the links and additional text removed: Learn how to solve equations using the angles sum and difference identities. Using the angles sum and difference identities, ...

Being able to identify which formula to use, sine or cosine, and when, is necessary to answer questions on this topic successfully. Check you are confident in how to use the sine and cosine rules.