[tex]y = Acos(Bx - C) + D[/tex]
The A is amplitude, B is to find the period, C is the phase shift and D is the vertical shift
Amplitude = [tex]A = \frac{1}{7}[/tex]
Period = [tex]\frac{2\pi}{B} = \frac{2\pi}{8} = \frac{\pi}{4}[/tex]
Phase shift = [tex]C = - \frac{\pi}{6}[/tex]
Vertical shift = [tex]D = -5[/tex]
