What is the equation of the midline of the function f(x)=5.6sin(1.2x−2.3)+1.8?
y = -2.3
y = -1.8
y = 1.8
y = 2.3
f(x) = a{trig}(bx - c) + d
a is the amplitude
2pi/|b| = the period
c/b = the horizontal phase shift
d = midline
Following this generalization, the midline is y = 1.8
+0 
