Question

Thaddeus models the number of hours of daylight in his town as

D(t) = 3sin(t) + 12, where D is the number of daylight hours and t is the
time in months since January 1.
What are the least and greatest numbers of daylight hours over the course of
a year?

Answer 1

(π2,15)(π2,15) is a local maximal

(3π2,9)(3π2,9) is a local minimal

Explanation: