y=2cos 4x+1 tentukan max,min,dan periode

jawab

y = 2 cos 4x  + 1

nilai cos 4x = 1 atau cos 4x = -1
y = 2(1)+ 1  = 3
y = 2(-1) + 1 = -1

maksimum y = 3 
minimum y = - 1

y = 2 cos 4x + 1
a= 2 , 
k = 4
c = 1
Periode = p = 2π/k = 2π/4 = π/2