In a 24-hour period, a human's body temperature will vary ab When at rest (usually at night), the body conserves heat and the body temperature drops. During activity (usually in the daytime), the body produce heat and the body temperature rises. This situation can be modelled by the periodic function y T temperature in degrees Fahrenheit and x represents time, with x=0 corresponding to 12 A.M. 1.8 sin(x) + 98.6 where y represents the bod 1. Find the derivative of y = 1.8 sin³ (x) + 98.6. (3)

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