Question: Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function b(t) = 8.5 2.8 cos(it) 157

Variable stars are ones whose brightness varies periodically. The brightness of

Variable stars are ones whose brightness varies periodically. The brightness of a certain star is modeled by the function b(t) = 8.5 2.8 cos(it) 157 where t is measured in days. (a) Find the period. days (b) Find the maximum and minimum brightness. (minimum) (maximum)

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