1. The equation D(m)=4.3sin(0.5(m-3))+12.2 can be used to model the amount of daylight hours Londoners experience over m months starting in January. Part A: What is the longest duration of light that can be expected? What is the shortest? How do you know? Part B: During which months can Londoners expect to observe exactly 12 hours of daylight? Show all of your work and explain your reasoning.