1. The problem statement, all variables and given/known data 4.) Determine the average power in an RLC circuit. Derive an expression for the resonance frequency in terms of L and C. Is the average power a maximum or a minimum at the resonance frequency? 2. Relevant equations 3. The attempt at a solution I have circled in red the part that is giving me trouble, all the rest of the solution i can do, is that part some identity or rule i am missing?