An object is attached to a spring that is stretched and released. The equation d=-8cos(pi/6 t) models the distance, d, of the object in inches above or below the rest position as a function of time, t, in seconds. Approximately when will the object be 6 inches above the rest position? Round to the nearest hundredth, if necessary.
A)0 seconds
B)1.38 seconds
C)4.62 seconds
D)8 seconds
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