This document discusses strategies for verifying identities in trigonometry. It notes that identities show two items are identical and it is usually best to work with the more complicated side of an equation. Some strategies suggested are to write everything in terms of basic trig functions like sine, cosine, and tangent, replace combinations with simpler expressions, and try to write all terms with a common denominator to show two sides are equal. The document concludes by assigning practice of verifying identities from numbers 6 to 12.