How do you find the domain and range for #y = 3 cos 4x#? Trigonometry Graphing Trigonometric Functions General Sinusoidal Graphs 1 Answer MAXIMILIAN C. May 1, 2018 Domain: #x=#all real numbers Range: #[-3,3]# or #-3<=x<=3# Explanation: Domain: #x=#all real numbers (normal cos function so no domain restrictions.) Range: #[-3,3]# or #-3<=x<=3# (Amplitude is 3.) Answer link Related questions What does sinusoidal mean? Given any sinusoidal equation, how do you identify the type of transformations that are made? How do you graph any sinusoidal graph? What does the coefficients A, B, C, and D to the graph #y=D \pm A \cos(B(x \pm C))#? What is the period, amplitude, and frequency for the graph #f(x) = 1 + 2 \sin(2(x + \pi))#? What is the period, amplitude, and frequency for #f(x)=3+3 cos (\frac{1}{2}(x-frac{\pi}{2}))#? How do you graph #y=2+3 \sin(2(x-1))#? How do you graph #y=2 cos(-x)+3#? How do you graph #y=3cos(4x)#? How do you graph #y=(cos2x)/2#? See all questions in General Sinusoidal Graphs Impact of this question 4453 views around the world You can reuse this answer Creative Commons License