Solve the problem.The voltage E in an electrical circuit is given by E = 5.7 cos 110?t, where t is time measured in seconds. Find the amplitude.
A. 5.7
B. 110?
C. 11.4
D. 110
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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? 2
A. 
? 
B. (-?, ?)
C. 
D. ?
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