1. The problem asks us to explain the mathematics behind the first two answers given earlier. 2. Since the exact answers are not referenced here, let's clarify that each solution involves step-by-step reasoning using algebraic manipulations or function evaluations. 3. Typically, the first step is to clearly state the given mathematical problem, such as solving an equation or finding a function's value. 4. Next, intermediate steps will include simplification, transformation, or substitution to make the problem easier. 5. The final step involves evaluating or simplifying until reaching the solution. 6. Without the specific answers, a general approach is to carefully follow each algebraic step, ensure proper calculations, and verify the logic. 7. If you provide the explicit expressions or problem statements of the first two answers, I can give a detailed, step-by-step mathematical explanation for them.