Please help The parent cosine function transformed to create function m through a phase shift left 3 units Which equation could represent function m?
OA m(x) = cos(3x + pi)
OB . m(x) = 3cos(x - pi)
OC . m(x) = cos(3x - pi) m(x) = cos(1/3 * x - pi) OD .

Step-by-step explanation:

y = A cos (Bx - C) + D

D = (max + min)/2     =     (3 - 11)/3      =  -4

A = max - D               =     3 - (-4)         = 7

Period = 9π/4 - π/4   =    8π/4            = 2π

B = Period/2π           =    2π/2π          = 1

Phase Shift = π/4 - 0 =     π/4

C = B · Phase Shift    =  1 · π/4            = π/4

Equation:

           y = 7 cos (1·x - π/4) + (-4)