Solve the problem.The length of a British nautical mile varies with latitude, according to the formula 
where ? is the latitude in radians and l is in feet. Find the average length of a nautical mile for latitudes between ?/4 radians and ?/2 radians.
A. 4767 ft
B. 6064 ft
C. 18,263 ft
D. 9533 ft
Answer: B
Mathematics
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