Dividend valuation model (calculating the value of re)

Hello Mr. John,

Thank you very much for not just writing formulas and doing calculations but also explaining the logic behind them each time. I really do appreciate your effort.

In the video (chapter 17 lecture 17.1), you mentioned that the rearranged formula for the calculation of cost of equity is not given in the exam. But when I look at the past exam papers, I can see the rearranged formula in the formulae sheet. I would like to make sure that do we really need to learn the formula?