How to plot the graph of f(x)=cos 8(pi)?

1 Answer
Jul 28, 2015

The line y = 1.

Explanation:

First of all, note that there is no dependence of the function on x. Thus it is a constant function. We need to find the value of the function.

We know that the period of cos is 2pi. Thus we write:
cos(8pi) = cos(0 + 4 . 2pi) = cos(0) = 1

Thus the graph of the function is y = 1, a line parallel to the x-axis having y-intercept of 1.