Question

Given the function y = 3cos(3x + pi), identify:
Amplitude (if applicable, give the answer in fractional form)

Period (in radians as a multiple of pi - note: do not write "rad" or "radians" in your answer)

Phase Shift (if the shift is right, enter + and if to the left, enter - before the number; if none, enter the number zero)

Answer 1

y = 3cos(3x + pi)

y = 3cos 3(x + π/3)

amplitude : 3
period = 2π/3

phase shift: π/3 to the left

Answer 2

find the domain and the rang for the following function
Y=3cos 3x