1. The problem statement, all variables and given/known data Can anyone here help me find how and where trig identities are used in real life. can you also tell me which identity(with example) and is used for what purpose and how. 2. Relevant equations 3. The attempt at a solution I found out that it is used in the field of engeeniering. It is used in converting sounds in between amplifiers but could not find any examples and could not understand how they are used.