Question

29. Find
30. Find the domain and range of the function f(x) = 1+3 cos2x ​

Answer 1

Answer:

domain: R

range :[-2,4]

Step-by-step explanation:

domain is any real no. since the cos function is defined for all real values.

but range is in an interval since the maximum value cos function can take is 1 and minimum is -1

therefore it's range is [-2,4]