Sales of computers are subject to seasonal fluctuations. Computer City's sales of computers in 1995 and 1996 can be approximated by the function
?
?
where t is time in quarters (
represents the end of the first quarter of 1995) and 
is computer sales (quarterly revenue) in billions of dollars. Estimate Computer City's maximum and minimum quarterly revenue from computer sales.
?
A. 
,
B. 
,
C. 
,
D. 
,
E. 
, 
Answer: E
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