Question 1173711
The temperature at time t=0 (midnight)is 75 degrees, and the temperature
oscillates over a range of +/- 10 degrees during a 24 hour period. 
Thus the amplitude of oscillation is 10, and the midline temperature is 75.
A complete cycle of 2pi takes place over 24 h, so the "angular frequency" is
w = 2pi/24 = pi/12
So the equation is D(t) = 10sin((pi/12)*t) + 75