Answer is C: (-∞, ∞)
Answer:
Step-by-step explanation:
There is no restriction on the input values of x , since it is periodic it can have any real value. Hence the domain of cos (2x) is (-∞,∞).
Because cos is periodic the output value keeps on repeating for any smaller or bigger input x .
Answers :D18
Because I did the marh
f(x)=3^x plot = see attachment
