The average wingspan of a certain species of moth is 8 cm. The wingspan for new moths varies in a periodic manner from year to year. An equation that models the wing span isw(t) = cos^3(t) - sin(t - 3) + 8, where w(t) is the wing span in cm, and t is the time in years. A biologist monitors the moth over a 25 year period. What is the range of the wing span? (Be accurate to the nearest tenth of a cm.)