# Differential equation

#1
Confused on the last part on showing the difference between the highest and lowest water level after a week
Last edited by Student 999; 1 month ago
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1 month ago
#2
(Original post by Student 999)
Confused on the last part on showing the difference between the highest and lowest water level after a week
They're just looking at value of t >= 7, i.e. after a week. For t > 7, the first term is close to 0, and the second term is 3cos(t), which varies from -3 to3, and hence the range.
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#3
(Original post by ghostwalker)
They're just looking at value of t >= 7, i.e. after a week. For t > 7, the first term is close to 0, and the second term is 3cos(t), which varies from -3 to3, and hence the range.

My bad I interpreted it as the difference between water levels from t=7 and t=0
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