Trigonometry
Determine the amplitude, period, phase shift, and vertical translation of the given trigonometric function.
y = 6 cos (x + π/9)
Amplitude = 6, period = 2π, phase shift = π/9 units to the right, vertical translation: none
Amplitude = 6, period = 2π, phase shift = π/9 units to the left, vertical translation: none
Amplitude = 6, period = 18π, phase shift = π/9 units to the left, vertical translation: 6 units up
Amplitude = 3, period = 18π, phase shift = π/9 units to the right, vertical translation: none