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Analyzing problems involving definite integrals

Problem

Consider the following problem:
The water level under a bridge is changing at a rate of r(t)=40sin(πt6) centimeters per hour (where t is the time in hours). At time t=3, the water level is 91 centimeters. By how much does the water level change during the 4th hour?
Which expression can we use to solve the problem?
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