What is the period for the function y = -4 cos (5x +3)? (4.3)

a. -4
b. pi
c. 2pi/5
d. -5/4
e. none of the above
(answer E is incorrect)

The periodicity of function is

Solution:

Given that we have to find the period of function

Given function is:

Use the below formula:

Thus,

Now find the periodicity of cos(x)

We know that,

periodicity of cos(x) =

Therefore,

Thus the periodicity of function is

8121 because

130,000 divided by 16 is 8121