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a cepheid variable star is a star whose brightness alternately increases and decreases. suppose that cephei joe is a star for which the interval between times of maximum brightness is 4.4 days. its average brightness is 4.5 and the brightness changes by /-0.4. using this data, we can construct a mathematical model for the brightness of cephei joe at time t, where t is measured in days:

Sagot :

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