"Standard form of cotangent function " y = A cot (Bx -C) + D
y = -3cot graph{-3 cot(x/2 + pi/2) - 1 [-10, 10, -5, 5]} (x/2 + pi/2) -1
A = -3, B = 1/2, C = -pi/2, D = -1
Amplitude = |A| = "NONE for cotangent function"
"Period = pi / |B| = pi / (1/2) = 2pi
"Phase Shift " = -C / B = (pi/2)/(1/2) = pi, pi " to the right"
"Vertical Shift " = D = -1