Answer :

max. value = 4, min. value = 2

We know that


-1≤sinӨ≤1


-1≤sin4x≤1


Adding 3 on both sides,


We get


-1+3≤sin4x+3≤1+3


2≤|sin4x+3|≤4


Hence min.Value is 2 and max value is 4


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