Solve the problem.In an electric circuit, the electromotive force is defined as V = cos 2?t, where t is time in seconds. Solve the equation for t.
A. t = 
arccos V
B. t = 
cos V
C. t = 2? arccos V
D. t = 2? cos V
Answer: A
Mathematics
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?
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where x is the time in months, with x = 1 corresponding to January, 
and 
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